As you do not have a full licence from your home country Ireland, you can not drive in Australia with it even with a supervising driver. So when you get to Oz you need to apply for an Austalian provisional licence.
Are you going to Oz as a visitor , working student, or to emigrate ?
visitors can not apply for a provisional licence , you need an Australian residential address.
Same would apply to driving in any other country including mainland UK (not sure about N Ireland) only a person who has a FULL driving licence from the home country can drive .