Just a quick note about Darwin.
A lot of the NT operators have their head office there and you need to see them to have any chance of getting a job. If they do hire you (as distinct from employing you as a casual), you will be sent bush to one of their bases.
As a casual, you may be able to stay in Darwin but you will be on the bottom of the pecking order for work - employed pilots, senior casual pilots, junior casual pilots. The result is that you will need some form of employment other than flying to survive.
You could not expect a post in Darwin until at least 12 months in the bush. The quality of the bush postings depends to a very large degree on exactly where you are posted. All of them are guaranteed to give you a lot of experience in a short time.
Good luck.