ahmed,
You should do a search around these forums to get an overview of Australian med to help in asking questions that haven't been answered a number of times before.
In particular, Wollongong has nothing to do with your residency. You would graduate with an MBBS (or the equivalent) from the school, then you'd apply for internship through the state's health authority, as a former int'l student. It's generally easier to get an internship in your own state (depending on state), but due to the medical student 'tsunami', some states will be pressed earlier than others for sufficient spots for their grads, which pressures first affect int'l students. The one way to get around most of the hassle at this stage is to figure out a way to get permanent residency before applying for the internship ballot - really by the beginning of your final year. At any rate, you're a paid doctor from internship on.
After internship, there is no automatic restriction to which fields you can specialize in -- the criteria for each is specific to the respective college, and vary quite a bit, but don't have much if anything to do with your nationality per se. Most colleges require you to finish at least another year after internship before considering you, and a few (e.g, surgery, radiology) will in all likelihood require several more years first.
Echoing others re your stats: they are sufficient to be seriously considered by any med school here, and would get you accepted by most so long as you didn't stuff up the interview. I didn't know that Wollongong looked at factors other than interview, GPA and MCAT, but it's great to hear, both that there's now more variety of selection criteria for future docs here, and that a school's recognized its value (at least in terms of marketing niche!)