Tax will be deducted off your earnings and is about 29% for non residents. It gets higher the more you earn! The Australian tax year is at the end of June.
The good news is that a lot of your tax can be reclaimed. All you need is a group certificate or final payment summary when you leave your job. Also keep receipts for any expenses over $300 and they might be deductible.
The easy way to do it is let a tax specialist sort it all out. Check what they will charge you and best to go for an inclusive fee. Make sure the tax agent has a licence number.