hey, welcome aboard!
where in sydney are you?
I live near campbelltown, the skies arent great there but better than the rest of sydney. my astro society goes to a field near camden (the oaks) which is moderately dark, and to another place in ivan milat country which is pitch black.
there are central coast boys that i see on occassion who meet up at kulnura which is about as good as the place i go to near camden.
WS astro soc goes to linden observatory which is ok too.
hope this helps.