Directing, devising, performance, writing
try for the VCA, if that fails do a Theatre Studies degree and student theatre at a uni that offers them. (completely sincere advice.) try to avoid tafe unless it suits your learning style.
VCA or TAFE or: learn on the job
Backstage theatre and design
I went to TAFE for this and it was not easy, I expect VCA was even more difficult. You can volunteer as well