Before starting, make sure you have a myGov account linked to Centrelink and your Customer Reference Number (CRN), if you have one. Gather identity documents, bank details, tax file number, income and employment information, rent details, and relevant documents about your partner, children or assets. The exact information required depends on the payment you are claiming, and Services Australia may ask for further evidence. Check the relevant payment page on servicesaustralia.gov.au for the current checklist before submitting your claim.