An International Driving Permit is not a licence - you must also have a current Australian licence.
To obtain an International Driving Permit (IDP), please contact the relevant IDP authority in your state.
New South Wales
NRMA City Branch
RAA (Royal Automobile Association of South Australia, Inc)
RAC (Royal Automobile Club of Western Australia Incorporated)
AANT(Automobile Association of Northern Territory Inc)
Tel:(08) 8981 3837