Have you used the search function?
No? Well here is what you'll find in brief.
Do you have the right to live and work in Australia? No? Forget about it unless that 500 multi is on something like a SAAB or Dash-8. Even if you got sponsored by someone like REX I doubt your missus would get the right to work in oz with her hours.
If you have Australian or NZ citizenship or residency, then enjoy!