Passport, student visa, aeroplane ticket, money, important documents and valuables. Items to declare at customs. Spare copy of the front pages of your passport and visa. A jacket as you may get cold. Only pack what you can carry.
Excess baggage is expensive to bring into Australia.
Extra goods can be sent after you have found accommodation. Do not bring prohibited items such as animal products eg dried meats or seafood, herbs and spices as these are against Australian customs regulations Luggage should be locked and tagged with your name, address and contact telephone numbers.