absolutely try to save up a little before you move out. When I moved out I had like $2k in savings. Bad fucking idea. Remember when you start renting, you are typically required pay a bond which is four weeks rent, as well as your first month's rent straight up. Having money in savings means that youll have a buffer if you lose your job or something like that. I quit my job last July, and have been living off savings since. It's probably gone down by around $3-4k since, but with that said, I am also on a Centrelink payment of $560 per fortnight.
On that note, make sure you are eligible for Centrelink payments. Centrelink is not going to pay you because you want to move out and gain independence, you need to have a reason. That reason may be because you live too far to travel to and from uni every day or something else. But make sure you're eligible because moving out without Centrelink payments, though possible will be REALLY stressful and challenging if you're coming straight out of high school.
And remember it's always safer to over budget than under budget. I don't know which area you're hoping to move to, but $170p/w including all bills is ridiculously cheap. Go on domain and realestate.com and check the prices of accomodation. And also, if something looks too good to be true, it probably is. There are a lot of nasty people offering accomodation on gumtree for example.