Holybejasus,
The days of getting a CPLH/low hours and going mustering are long gone unless you have good cattle experience. There are loads of ringers out there training or with completed CPL's that will be WELL infront of someone who has no experience on the North Australian stations.
That's not the response you wanted to hear mate I know but those are the facts
There are jobs around OZ for Low hour pilots, these are mostly in tourism.
First you need to get yourself an Australian Licence then you need a work permit of some sort and then you need to be here knocking on doors, on the other hand if it is mustering you're interested in have a look at the Queensland country life newspaper online, they have lots of adverts for jobs on stations, mostly ground work but that would be a good start and get you the experience you need before you can work cattle from the air.