I always wanted to be a mechanic, too!
Well, my good mate got his apprenticeship with Jarvis Toyota by simply taking a Mechanic Cert 1 or similar course at Tafe aaages ago. When he was there, he did a work experience placement and they liked him, so offered an apprenticeship!
Otherwise, if you get into Tafe and do a Mechanics course, I heard that mechanics first look in these courses for job candidates?
Or, just search the papers? Seek? Even try a job agency?
There's plenty of positions around, although, becoming a Diesel mechanic seems all the rage these days, as they're quite sought after.