How to open a farm in New Zealand?

Essentially, as long as you have money, you can buy a farm.

There is a real estate website that lists farms for sale. There are many kinds, such as wasteland, planting land, pasture, fishing ground, forest and so on. It is generally necessary to contact the real estate agent who sells these farms. After seeing the farm, you need to ask a lawyer to look at the contract, go to the bank for a loan, and then negotiate the price with each other (some farms have a price tag, and some need to participate in the auction).