your DP can apply for Austudy online and should do it as soon as possible. Today if he can - he'll only be paid from the date he applied. Austudy can ONLY be applied for online (not over the phone or in office). The online claim
will tell him what documents he will need to supply for the claim to be assessed and he or you (with his permission) can lodge the documents in the nearest DHS service centre.

PP you need to do over the phone first, then they'll usually make an appointment or tell you a window of time to go to an office and what to take. Call first thing in the morning if you can. If you go into an office, they will most likely direct you to a phone.

If you supply all of the documents they ask for at the first point and your situation is simple (no investment properties etc) it should be reasonably straightforward

Goodluck!