For a single person it cost around $10000 to $12000 per year to maintain their living expenses.
Note: High value courses like medical and veterinary are not included
As international student you have to pay your tuition fee first before you study. Normally all university take about 50% in advance from the 1st year's tuition fee. Overseas Student Health Cover (OSHC) also has to be paid with the tuition fee.
Other additional costs like course materials and access to institution facilities will be charged when you are at your designated univesity.