If you have the intention to reside in NSW and have received the appropriate visa/s you are not considered a visitor thus you may only drive on your overseas licence for a maximum of three months after your arrival in Australia. After this period if you wish to continue driving you must get a NSW licence.
To gain a licence is NSW you must be over the age of 17. If your licence is written in English you must present your licence at a Road Transport Authority (RTA). If your licence is not written in English you must get an official translation from either: The Community Relations Commission for Multicultural NSW; or The Commonwealth Department of Immigration, Multicultural and Indigenous Affairs. You may also be required to provide a letter from a relevant diplomat if additional licensing information is needed.