I would say it is a pretty straightforward process. In an Immi account, we created 2 sets of application (for myself and for my partner). My child’s application was attached with mine. In our application we provided/uploaded the following documents:
MYSELF:
Evidences of arrival in Australia (old passport with entry stamp), Form 1195, birth certificate, driver licence, current passport biopage and photograph (endorsed).
(CHILD) Evidences of arrival in Australia (old passport with entry stamp), Form 1195, birth certificate, current passport biopage and photograph (endorsed).
PARTNER:
Evidences of arrival in Australia (old passport with entry stamp), Form 1195, birth certificate, proof of age card, passport biopage and photograph (endorsed) and marriage certificate.