Flying school route at Bankstown then Hoxton Park. Went bush to get a job.
Why? eyesight too poor for the RAAF and there were no cadet schemes when I started.
The big thing to note with respect to the RAAF, you really have to want to be a military pilot. Sure, the flying's free but it's very competitive both through ADFA and direct entry. You'll probably do a B Sc.
Batchelor of Aviation? well, they aren't required but if you want one, why not.. Look at the cost and how you'll pay it back. ie HECS etc.
Personally, out of the various cadet schemes I'd go for the QF one. May as well aim at the top. I believe the Rex one has come under difficulty already. There's a couple of others around too.