Some of the good sites that could assist with such questions are:
My Future: http://www.myfuture.edu.au
VTAC guides: http://www.vtac.edu.au/courses-inst.html
Graduate Link : www.gradlink.edu.au
My Skills site that Australian government has created to support people: http://www.myskills.gov.au/?AspxAutoDetectCookieSupport=1