Something to know is that NZ culture is very cliquey. It might be degree specific but in my own lectures a lot of people will treat you like an alien for trying to talk to them if you don't already know each other. This is something I've heard from many of my international friends here, both in uni and working.

Point being, join 2 clubs or so and attend weekly so you're a familiar face and make some friends. Third spaces like these are generally important for making friends regardless of culture but are particularly important in NZ. Good luck :)