There are many websites providing information on living in Australia.
These few are useful:
https://www.studyinaustralia.gov.au/english/live-in-australia/living-costs – this is a good site identifying the costs of living in Australia.
If you have a school aged dependent, you will be required to pay full fees if enrolled in either a government or non-government school.
Check the government’s education website in the state you will be living in.