I would say the same way as moving here, look for short term furnished accommodation then Open a bank account to transfer money, Buy a car & sort insurance & tax (Take Aussie no claims proof). Look for house (purchase or rent) wait for possessions or buy new. Probably worth taking proof of Aussie address, paid bills, bank acc'ts etc as many financial institutions require proof of past abode etc, Register with doctors & dentist. I'm sure the rest will come as you need it. Going back after 28 years seems a long time, what is your reason ? & good luck.