WANTED: Adelaide Opera Teacher

Hey, I'm a fifteen-year-old mezzo-soprano classical singer. I have enough high notes to pass as a soprano though (I can play characters like Phoebe from 'The Yeoman of the Guard' etc). I would love to get into opera but I need better training. I've been doing classical singing for almost eight years now, so I have experience. Could anybody recommend opera teachers in the Adelaide metro area (preferably in the north-east)?
Thanks.