G'day Steve,
Mate i just attended the WAAC monthly meeting last night, I can tell you they are all a great fun bunch of people and from what i have gathered the best way to become a member is to just turn up at the meeting held the first thursday of every month at the Unanderra Community Centre on the main road, They also have regular observation nights in a location along swamp road, Jamberoo, I have not yet purchased a Telescope though i have the money ready to go i thought the best thing to would be attend an observation night, Take a look through other members scopes and see which one i like, So their next Observation night will be Saturday the 16th of May and ill be attending to have a look, Feel free to turn up and have a look, Also if you would like to get in contact directly with the club, Please find there website below
http://www.users.bigpond.com/paul.b/
Also they have a yahoo group which they talk to each other and organise observation nights, have monthly astrophotography competitions to see who can get the most mind blowing photo and well the link is below and there is alot on there to look at and read, Just register and you will soon start talking to people and learning more about astronomy
http://tech.groups.yahoo.com/groups/waacers
I hope this helps and hope to talk to you again soon, Aaron