Some of those topics you mention are okay as background (and a passing mention would show you have some awareness). But what is probably more important is how things work in NZ, in normal life, NOW. For instance... If you have children, what is the system for schooling? How do you find a doctor, and how does the Health Service work? How will you find somewhere to live, and do you have an idea of what it will cost you? What is the transport system like where you are hoping to go and set up home, and/or will you need to run a car? If so, what about your driving licence, and how do NZ rules of the road differ from where you are now? What are your interests, because if you want to follow them up in your leisure time, you will need to find some like-minded people/clubs/groups? etc., etc..
A lot of these matters can be found on old threads here. If you use Google, enter "site:enz.org" then a key word, because that does a more sensitive search than the forum's own.