Oaktree is a child-safe organisation. All volunteers must get their Working with Children Checks within one month of starting in their role. Make sure you apply for the volunteer check - they're free, except for WA and TAS volunteers, who will need to pay a small fee, then submit a reimbursement form.
Once you've applied for your Volunteer WWCC, you can fill out the Volunteer Registration Form and include your application details (new vols only, obv.). You'll need to update these details once your application has been processed and your WWCC has been approved - you can do that here (all vols).
SA vols - you'll need to get a Police Check instead.
Vic Vols - select #52 on the drop down list of Occupational Work Codes.