IMO there is a shortage of one thing in the Australian aviation industry and that's entry level Multi Jobs. Unless you are lucky enough to get into a charter company that has the opportunity of progression on multi's its very difficult.
I honestly think that the best option for a young guy whom wants to make a jet caerer in Australia today would be to spend a couple of years getting up to 1500 hours single time with multi ir rating and heading of to America for 4 or so years and getting Jet command time and then coming back home meeting the mins for all F/O jobs downunder.