"How is the budget"? Do you mean how much you should budget for?
For an international student, the tuition fees at university will probably (just an estimate) be around AUD20,000 per year. You need to add the cost of flying training to that figure. So it's likely to be at least AUD100,000 to get a degree and a CPL with MECIR, if not up to even around AUD120,000.