National Police clearance:
We recommend you obtaining a national/federal Police clearance before leaving to be in conjunction with your Working With Children Check (if you have one). We say this as in the UK there is the equivalent for UK nannies called the Nanny CRB Checks. Families find that they offer peace of mind and are becoming more popular. However, the legislation in the UK does not allow the self-employed or individuals to apply for a CRB check on themselves. Parents who employ a nanny/au pair/babysitter directly cannot apply for a CRB check (something to remember if applying for a position privately); however, if you go through an agency they are legally bound to run an Enhanced Disclosure on all their nannies to ensure that they have no previous convictions and are entirely suitable to work unsupervised with children. So if you are able to provide an Australian document it may be sufficient.
Current 1st Aid Certificate:
All agencies will require this and most families will ask for it. It is best to have a Senior 1st Aid certificate or at the very least a nationally accredited and we would recommended to obtain one from a well recognised one so there is no question over it.
Up to date references with contactable details such as an email address or phone number will be required from a reputable agency and will most likely be asked from the family if they are employing you directly.