What are the chances that I would be employed here in Australia after I finish my course?

It's difficult to give a general answer to this question.

However, you can improve your chances of obtaining a skilled job by:

Improve your English Language Ability: improving your communication skills will significantly increase your effectiveness in an interview
Seeking work in your field during your studies: even if you work as an unpaid intern in your occupation, this can make your CV more impressive and help you to make contacts with potential employers
Making use of the University Careers Centre: the Careers Centre can give you tips on preparing your resume and interview technique, as well as give you information on potential employers in your field
Professional Year: if you are studying IT, Engineering or Accounting, you can complete a Professional Year after your studies. As this involves an internship, as well as workplace skills training, this can greatly enhance your chance of getting a skilled job after your studies
Making friends with your Australian classmates: Most jobs are not advertised and the better your contacts, the more likely you will be aware of job opportunities which arise