new to this site, just asking a question about WAAPA

I dont really know how to use this site as i am only new to it, but it looks like a good site to ask questions. I am currently 16 and in year 11 and would like to further my study in the performing arts. I am thinking of auditioning for WAAPA in musical theatre and if not get selected for that maybe NIDA when i turn 18. for the musical theatre course, what is it about? whats the audition process like? how long does the course go for? I train 4 hours a week doing jazz,tap, ballet and contemporary and do drama at school, singing i am average, would you suggest lessons? i want to give myself the best chance of getting in thanks