Welcome!
I also had an Amiga 2000. That was a nice machine, but it didn't have any nice goodies like yours has. I would have killed for that 040 card back in the day.
Games: your best bet is English Amiga Board, because those guys know their games inside out and I'm quite sure that they will be able to help you find all the games you want.
Here is the link:
http://eab.abime.net/Now for technical help and serious matters relating to hardware and software, you just stay right here on Amiga.org. This place is the best for trouble-shooting on classic Amigas.
And don't worry about being Ozzie: there are many here and most of them are good chaps. I am a Saffer and they let me in here, so there'll be no worries for you mate...