Maryd: Novelists most benefit from hiring a good mid-press literary agent, though I don't know of any from memory who serve Australian authors; it would be a good idea for you to think about hiring one though, if you believe in your abilities with the novel. SE Hinton was near my age 30 years ago when
The Outsiders made her the beloved sensation of my upper track English teachers.
I don't know if I prefer her fate (a flash in the pan) or mine as the interminable flat foot, but hiring an agent is like much else: you research, pitch, and make sure you do your best to understand their commission, the percentage you will get off your sales, and what you are giving to the publisher. It is a good idea to reserve film rights, etc.
This stuff is daunting, even for me, but for a novelist especially. I keep up now and again about agent deals. You should start reading up too
.
Agents are good for novels, some non-fiction deals, and scripts, especially. You can't get anywhere near a studio without a reputable agent representing you. For journalists, poets, most freelancing situations, agents aren't really necessary.