Who is a legit and fabulous Brisbane Acting Agency?

Hi, I was wondering if someone could recommend a reputable acting agent in Brisbane I could sign-up with... I am interested in anything from Extra work, to TV commercials to Theatre; an agent that covers all these things would be great! I am clueless as to what to expect from an acting agent too, so any tips or wise words of advise would also be most appreciated :) I hope someone can help, Kindest Regards JacquiB