www.casa.gov.au
Follow the link for rules and regulations and you will find what you need.
Redsnail is right. You could have umpteen hrs PIC but if its all single it counts for little. 500 multi command or bust!! (as far as the RPT's are concerned)
I had some poor buggar with about 1500 multi turbine experience, (all RHS) knock on the door looking for a job on 210's doing scenic flights in the middle of the Northern Territory due to his cadet programme affording him very little PIC time, single or multi.
Qantas require 500 PIC only, and that gets your name on the end of a very, very, very long list.