I love sweet kiwi,
Just to flesh out Lapon's accurate remarks, I'd add that US carriers have to be
accepting E3 applicants. That's a bit of a wildcard. There was a time a few years ago when US regionals were taking young, lower-time Aussies right off the boat but that doesn't appear to be the case currently (the ACMI carriers may be an exception for very experienced pilots, but I don't know).
It's certainly something to keep an eye on when your experience gets to that point but I'd move the E3 option waaay down your planning list. Here's a thread detailing the history of the E3 issue if you want to research it in a leisure moment. Good luck on your career efforts:
Australian pilots can work for US regionals.