Hi,
Do a uni course, but not in Aviation. Do it in something else you're interested in instead. Aviation degrees do not help you get a job as a pilot, but it's great to have an unrelated field of specialisation too, to broaden your life experience.
Get your CPL on the side while you're at uni. Its tough working enough hours to pay for it all, but uni takes a few years anyway.
Once you have a CPL and night rating, go north and get a charter job. You get these jobs by meeting the chief pilot in person, not by emailing them.
Only get an instructor rating if you truly and genuinely want to teach other people. Do not even consider instructing as "hour building".
What are the type ratings going to be on? You will need Single Piston, with endorsements for constant speed propellor and retractable undercarriage. If possible get three or four hours on a Cessna 206 or 210. At this stage, endorsements on any twin are an unnecessary expense. You're only going to fly singles for a while anyway, and when it comes time for a twin, you'll know which twin. Likewise with an instrument rating. Become a proficient VFR pilot with a few hundred hours flying charter (ie, after you get a license) before your instrument rating. It will make the rating easier since you will know how to fly by then.
Likewise with the ATPL exams - leave them until you know a bit more about flying than you'll get with 250 hours. You won't need them for a few years, so wait until you know a bit more about flying, which will make the exams easier.
You will not start your career in Melbourne or Adelaide (unless you honestly and sincerely want a career as an instructor). You will start your career in Kununurra, Horn Island, Fitzroy Crossing, Warburton, Arnhem Land or Lake Eyre. Be open minded about this - this will be the best flying of your life.