need a lil help with Amateur Musical Companies

Hey everyone, Have just moved from Adelaide to Sydney and currenting residing in Potts Point. Am wanting to join up with an amateur theatre company as I was very involved in Adelaide. However, I dont know where to go! I have been trying to Google, abut keep getting confused. Anyone got any hints of good companies that are close to me, with a musical theatre flavour? Any help would be great!! Thanks, Joel