The information given here will help you with the Customs formalities when you land in New Zealand. Take a little time to familiarise yourself with the paperwork.
Work out exactly what you need to do when you enter the Immigration and Customs area. And be sure you have a good idea of what you are not allowed to bring into the country. After that, and all going well, you should breeze through with no problems at all. And if you do have any questions, just ask a friendly Customs officer.