I would suggest you take the theory test for a learner permit while in NZ and then go to a driving school. Once you are enrolled, the instructor can access how much practical driving lessons you need, if you do need any at all or just a refresher course.
It is not compulsory for you to get driving instruction at all in NZ but as a learner permit holder you need to drive under supervision at all times, meaning you need a driver with at least 2 years NZ driving license, sitting beside you at all times while you are behind the wheel.
Then once you passed the practical test, you can get a restricted license where you are only allowed to drive during daytime hours for a short while and then finally graduate to a full license.