To work in New Zealand you will need a work visa. There are a range of visas available depending on where you are from.
Once you're here you'll also need to obtain an IRD number (a unique tax number) and a bank account into which you can be paid.
If you are planning on WWOOFing (volunteering in exchange for accommodation and food) you will not need an IRD number or a bank account but New Zealand law still requires you to hold a work visa.
For more information on work visas and working holiday programmes please visit the New Zealand Immigration Service’s website:
http://www.immigration.govt.nz/
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