It hugely depends on where you want to go!
JOBS:
I live in Sydney (as do most of the Australian QCers), and have for 3 or 4 years now. My boyfriend has been trying to find bar/barista/waitering work for almost a year, however he doesn't have as much experience as you. And I guess when I came here I had quite a lot of experience as well, there were jobs being thrown at me but I was just trying to get barista stuff.
Good job sites are Seek, Mycareer and Jobsjobsjobs, but doing the old walk around with resumes and a smile always helps.
HOUSES:
Housing is EXPENSIVE in Sydney. It is one of the most expensive places to live in the world. Your best bet is to hunt for sharehousing before you get here. You can find a room in the Inner West* for around $200AUD a week. Studio apartments go for around $300. Expect to pay 4 weeks bond up front.
Gumtree, flatmatefinders and share-accommodation.net are good resources. Gumtree is also great for finding furniture.
STUFF:
There is tons to do in Sydney and the weather and nightlife is pretty good. Yes, some areas are dodgier than others but I have not had any problems in the time I have lived here.
To finish: Come to Sydney, we're super cool. Although Melbourne is great too. All the other cities are much smaller and quieter but I am sure they are also nice.
*Bunches of suburbs have different names, ie.. the Inner West includes Newtown, Glebe, Marrickville (where est, eris and I live), St Peters, Redfern, Stanmore, Leichhardt, Petersham and a few others. It is probably the best place to live if you work in the city plus it is full of young people. It is about 20 minutes to the city via public transport. Public transport is pretty good and you won't need your own vehicle.
Don't try living in the city, it is full of people crammed 20 in a 2 bedroom apartment and there are very few supermarkets etc.