Pope Francis arrives for a prayer at Rome's Santa Maria Maggiore basilica early on his first full day as the head of the world's 1.2 billion Catholics. (Photo: AFP/Getty Images) Story Highlights Installation Mass for Pope Francis is set for Tuesday
Vice President Biden will lead U.S. delegation to Rome for ceremony
Francis hasn't warmed to Popemobile just yet
VATICAN CITY -- Pope Francis could have been excused for sleeping in Thursday, a day after shocking the world with a series of pontiff firsts: a Jesuit from Latin America who chose a name honoring St. Francis of Assisi.
But the newly elected leader of the world's 1.2 billion Catholics had a quick dinner with his fellow 114 cardinal-electors Wednesday night in order to rise early Thursday and pray for 30 minutes at Rome's Santa Maria Maggiore church. Outside, a crowd of around 150 faithful cheered.
Vatican officials confirmed Thursday that Pope Francis' official installation Mass will take place Tuesday at St. Peter's Square. The White House said Vice President Biden, who is Catholic, will lead a U.S. delegation to Rome for the installation ceremony.
At a Vatican press conference, details also emerged about the new pope's humble approach to his new position. After appearing on the balcony, Francis declined to use a private car with the license plate SCV1 - Vatican City 1 - to return to the cardinals' dormitory. "He said, 'I'll take the bus (that shuttled the cardinals to the Sistine Chapel), since that's the way I came here,'" said spokesman Rev. Thomas Rosica.
Pope Francis then went to pay pick up his belongings and pay his bill at the clerical hotel he stayed at before the conclave, "because he wanted to be sure to give a positive example to his fellow cardinals," Rosica said.
"We'll get used to a new way of doing things," said Rosica, referring to the casual style with which the new pope buzzed around Rome, greeting well-wishers at each stop. "The security forces are here to work with the style of whoever is the new pope. Remember John Paul II, and how many rules he broke doing things his way with his own style."
Later Thursday, the pope will celebrate Mass inside the Sistine Chapel with the 114 other cardinals who participated in the conclave.
Francis will stay on for a few days at a VIP apartment in the same Casa Santa Marta residence that hosted all the cardinals during the conclave. "It features a number of rooms (as compared to the simple one he stayed in as cardinal), which he will need for papal audiences," Rosica said.
Pope Francis also will go to the official residence and take off the papal seals on the doors - which prevented anyone from entering after Pope Benedict XVI left the premises - so work can officially begin on refurbishing it for the new pope.
Another significant item on the pope's to-do list is a visit with Benedict, the first pope emeritus in 600 years, who has been staying at the Vatican's fabled summer retreat, Castel Gandolfo, since his historic resignation last month.
Pope Francis puts flowers on the altar inside St. Mary Major Basilica, in Rome, on Thursday. (Photo: AP/L'Osservatore Romano)
Rosica said Francis will visit with the man he succeeded "some time in the coming days," and not Thursday as had originally been suggested. The two men did speak Wednesday night by phone after the election.
On Wednesday, throngs jamming St. Peter's Square roared with joy as Argentine Cardinal Jorge Mario Bergoglio, archbishop of Buenos Aires, stepped onto the balcony as the new pope.
"Brothers and sisters, good evening," he said to wild cheers. "You know that the work of the conclave is to give a bishop to Rome. It seems as if my brother cardinals went to find him from the end of the earth. Thank you for the welcome."
The crowd grew silent as Francis, 76, recited the Lord's Prayer and a Hail Mary. He asked the crowd to pray for him before he blessed them.
"Let us pray for the whole world," he said.
Moments later, the official Twitter account for the pope tweeted: "Habemus Papam Franciscum" — We have Pope Francis. It was retweeted more than 55,000 times in less than two hours.
Hours later, the Vatican updated the Holy See website with the first official portrait of the new pontiff and the Latin phrase announcing his selection. Besides English and Latin, the site is available in Spanish, Italian, French, Portuguese and German.
KEY FACTS: Meet Pope Francis
COLUMN: Why evangelicals should care about new pope: Column
Francis' papacy is one of firsts: He is the first Jesuit, the first non-European in modern times and first Latin American pope. He also is the first to take the name Francis, for the saint devoted to the poor.
The Vatican's lead spokesman, Rev. Federico Lombardi, who like Pope Francis is a Jesuit, expressed surprise at Wednesday's choice.
"We're (Jesuits) not used to seeking office like this, so I was stunned at what happened yesterday as I saw my brother come out on the loggia," said Lombardi. "It's a great calling, but a calling none of us aspired to. It's a call of extreme service. The idea of a Jesuit priest is very strange, I wasn't prepared psychologically. We are used to serving, not being the ones in charge. But I see it as a special compliment."
Bergoglio reportedly received the second-most votes after Joseph Ratzinger — Pope Benedict XVI — in the 2005 papal election. Despite being Argentina's top church official, Bergoglio never lived in the ornate church mansion in Buenos Aires, preferring a simple bed in a downtown room heated by a small stove. For years, he took public transportation around the city and cooked his own meals.
It's been widely reported that he had a lung removed as a teen, but Vatican spokesman Rosica said Pope Francis "did not have a lung removed," but had an operation as a young man due to an infection.
The cardinals took five ballots over two days to reach their decision by the required two-thirds majority. The first vote took place late Tuesday. Two morning votes Wednesday brought similar results — black smoke from the Sistine Chapel's chimney that meant no decision on a new pope had been reached. Late Wednesday, the smoke was finally white and Vatican bells pealed.
President Obama offered "warm wishes" to the new pope.
"As a champion of the poor and the most vulnerable among us, he carries forth the message of love and compassion that has inspired the world for more than two thousand years — that in each other we see the face of God," Obama said in a statement.
James O'Rourke, a management professor at the University of Notre Dame, a Roman Catholic school in South Bend, Ind., said Francis will need a strategic vision, team-building and financial skills and what he calls "charismatic empathy."
Many North American Catholics want a greater role for women in the church, O'Rourke said, while many Europeans oppose such a move. Catholics in Latin America want more vibrant parishes and the fast-growing Catholic population in Africa needs more priests, he said.
Fittingly, Bergoglio's new namesake, St. Francis, is famous for his vision of a talking crucifix telling him, "Francis, rebuild my church."
Contributing: Cathy Lynn Grossman, Katharine Lackey, David Jackson; Judy Keen and Lisa Tucker
Jorge Mario Bergoglio in 2012 
The Roman Catholic Church has elected Archbishop  of Buenos Aires as the new pope. He is to take the   and take over from the recently retired Benedict XVI.

White smoke rose from the Sistine Chapel chimney at 7:06pm (Rome time) yesterday, signifying that the conclave had elected a new pope after four unsuccessful attempts. Following his election, he appeared at a balcony in  to greet crowds of onlookers.

Introducing himself in St. Peter's Square, Francis was jovial: "Brothers and sisters, good evening. You know that the work of the conclave is to give a bishop to Rome. It seems as if my brother cardinals went to find him from the end of the earth. Thank you for the welcome." He went on to say: "Let's begin this long road from the Bishop of Rome to the people. Let us all behave with love and charity. Let us pray always not just for ourselves, but for others, for everyone in the word".

Born in Buenos Aires on December 17, 1936 and now aged 76, the new pope became a bishop in 1992, and was elevated to cardinal in 2001 by Pope John Paul II. As a child, he lost a lung due to an infection. He is the first Jesuit pope and the first from the Americas. He was the President of the Bishops' Conference of Argentina from 2005 to 2011.

US President Barack Obama made a statement about the election of the new pope: "On behalf of the American people, Michelle and I offer our warm wishes to His Holiness Pope Francis as he ascends to the Chair of Saint Peter and begins his papacy." Obama's statement noted the new pope was a "champion of the poor and the most vulnerable among us", and "as the first pope from the Americas, his selection also speaks to the strength and vitality of a region that is increasingly shaping our world".

US House Speaker John Boehner also pointed out the new pope came from the Americas: "I think that reaching out beyond the traditional continent of our church is another big step in the right direction of our church." British Prime Minister David Cameron said that the papal election was "a momentous day for the 1.2 billion Catholics around the world".

The , , said the election of a new Pope was of "great significance to Christians everywhere, not least Anglicans". He went on to describe the new pope: "Pope Francis is well known as a compassionate pastor of real stature who has served the poor in Latin America, and whose simplicity and holiness of life is remarkable. He is an evangelist, sharing the love of Christ which he himself knows."

In Argentina, he was outspoken against socially liberal policies including the provision of free contraception and gay marriage. Bergoglio said plans to legalize gay marriage in Argentina were "a plan to destroy God's plan" and "a move by the father of lies to confuse and deceive the children of God".

Vatican spokesman  said Francis would be known as Pope Francis; "It will become Francis I after we have a Francis II".