  This is the first of two papers aimed at economically capturing the collider
phenomenology of warped extra dimensions with bulk Standard Model fields, where
the hierarchy problem is solved non-supersymmetrically. This scenario is
related via the AdS/CFT correspondence to that of partial compositeness of the
Standard Model. We present a purely four-dimensional, two-sector effective
field theory describing the Standard Model fields and just their first
Kaluza-Klein/composite excitations. This truncation, while losing some of the
explanatory power and precision of the full higher-dimensional warped theory,
greatly simplifies phenomenological considerations and computations. We
describe the philosophy and explicit construction of our two-sector model, and
also derive formulas for residual Higgs fine tuning and electroweak and flavor
precision variables to help identify the most motivated parts of the parameter
space. We highlight several of the most promising channels for LHC exploration.
The present paper focusses on the most minimal scenario, while the companion
paper addresses the even richer phenomenology of the minimal scenario of
precision gauge coupling unification.
