You'll need a CPL, for which you will need 200 hours tt, of which 100 in command, 10 IF, 20 in command cross-country, a class one medical, a pass in the CPL theory exam (nothing like as tricky as the JAR version and much cheaper) and whatever dual training is required for a CFI to recommend you for flight test. You can't go for the "150 hour" CPL as that has to be enrolled in from scratch, and the qualifications and hours you have so far wouldn't count. So, come to Aus, convert your PPL, build up your hours, upgrade to CPL and then enroll in an Instructor Rating course. That's the easy bit because then you have to find a job. From where you are now you would need to allow about $30,000 and about six months.
Good luck, email me for more details if you like.