Hello,
Most academic staff who are looking from overseas are recruited directly before arriving in NZ. It is one of the few fields where you can get a job offer and be flown in for interview before having a visa. (And get relocation expenses)
Salary scale information is probably on the university website. And are always to be negotiated once you have a job offer.
Look at the university vacancy sites and places like jobs.ac.uk for NZ uni jobs. And have you contacted the departments you would like to work at?
Good luck!