Not sure about all the details yet. They just told me this over the phone. I sent in my application and now waiting to be accepted into the program and they will send me the details. But I would be working in the field (hangar) for companies they have contacts with I guess. Not sure if this would be paid work or volunteer work. Like I said, details still need to be ironed out. It's specific in my case as I am an international student and have certain requirements to meet for visas.
And yes you can just enrol in school without having a job.. With aviation australia, QIAE, or ATAE. TAFE seems to work differently.