Working professional since 1985
Check out Blue Murder: http://m.youtube.com/watch?v=1u_HLOJ1hM0
This is a good place to start for middle and lower class eastern urban Australian. There is some regional variation but it's very subtle and if you're not born and bred you won't notice the differences. Rural Australian and Indigenous Australian accents are more defined - look at Redfern Now for some Indigenous accents: https://vimeo.com/60794751. Hope that helps. Let me know if you want something more specific.