For the first time in a long time (since I was a student) I am going to have to organise some stuff with Centrelink and I'm not really sure where to start...

A quick little background; my DH has two sons and we have a little one of our own on the way. Up until now we have had both my DSS's about 33% of the time, therefore haven't been illegible for anything from Centrelink. Within the next 60 days one of the DSS's is coming to live with us full time so I need to start looking at what we need to organise through Centrelink. I think I need for us to apply for the Family Tax Benefit Part A & B, but have no idea if I need to be doing anything else? If anyone has any ideas I would love to hear from you.

Also, how do I even go about organising stuff like this? Do I just rock up at a centrelink office and stand in a line until I can talk to someone, or should I be ringing and booking in an appointment to see someone?

Hopefully it's all nice and easy and I'm just feeling overwhelmed for no reason

EDIT: Oh, and is there anything I need to do in regards to our little one that's on the way?