This blokes the most australian guy around at the moment if you need inspiration
Speak to Australians! :) Of course, Australian media is always good for input, but I think you'll find that interaction and feedback is more effective.
Of course you'll get a feel for how Australians pronounce their words and shape their sentences by listening to and watching enough media (Our habit of up-talking is horrible? Please don't copy that? haha), so if you're willing to have a go, you can use Vocaroo.com or Clyp.it to record your voice, and post it here.