The government websites like getatrade and www.newapprenticeships.gov.au are a good source of info - it really does depend on the industry you are interested in.
For some individual advice why not contact a Group Training Organisation - you can find a local one on our national directory at www.grouptraining.com.au
They can answer any questions so give them a call.
There are a wide variety of organisations that take on trainees in IT - best to talk to a group training organisation in your local area - see national directory on www.grouptraining.com.au