Hi Satindsi,
Please follow in line with check list. All you need to submit as follows below;
1). All relevant completed form.
2). LOA approval letter photo copy.
3). Photos all relevant person.
4). Birth certificates for all relevant person (photo copies).
5). Police clearance certificates for all relevant person (Originals).
6). No additional certificates, example; educations, jobs, bank statements, IELTS, etc.
7). Online payments receipt (Only application fees, $550+Spouse+ Dependent) which one applies for you? Also you need to complete fees payment form only top section not the bank details section, for bank details section you just need to attach receipt.
I hope it helps. Thank you.