http://www.ansaqld.com.au/member-clubs/
Try this link. It lists all the clubs in qld, but also categorises them by area so that it easy to pick out the Brisbane ones. Most ANSA clubs have members that are interested in a wide variety of types of fishing. Go to a few meetings and pick one that has the right 'feel' for you. Each club has a 'personality' of its own and will not suit everybody. Also be prepared to introduce yourself, and dont wait for people to approach you...or you might find yourself sitting in the corner all alone. (human nature never changes).
Best of luck
Greg