Best bet would be to get a AASA. Licence to begin with only $50 I believe, doesn't require you to be a member of SAU, but highly recommend you do for cams licence and other good deals
Then go to events section and enter into SAUNSW trackday next month and bring your friends who will be able to be passengers with you during the day
And can also fill out a form to join SAUNSW on the day