Have a look through all the parts of CAO 20 - Air Service Operations (some parts of which curiously apply to private and other flying also).
Enjoy the clusterf
k !
It was interesting coming over as an instructor, because the majority of Australian colleagues had even less of an idea of their own rules than I did, so it was impossible to get any help out of them. Just look at some of the arguments on here about the intent of certain rules!! If you have the time I would highly recommend sitting the CASA ATPL Law exam. Will help with getting to grips with it all.
I imagine coming over as a Chief Pilot will be even more difficult. Good luck!
PS. Also note that the even basics such as the definition of VMC also differs between the countries!!