It's all run by a big cash cow called Airways NZ Ltd. go here:
IFIS
and you can register free for IFIS, our GA flight planning and weather/notams system. You can log in and see what our wx/notam packs look like, its all free, ring Airways they can set you up. Flight plans will cost you about $50 a go I think, for VFR. You might get a SARWATCH cheaper, or free, I dunno.
Airways are the official publisher as well, go here
Airways Publishing.
Check with the aeroclub or wherever you rent from first if you're on a budget you can probly borrow some instructors charts.
The AIP is our big set of manuals with everything you need to know. Definately worth a read, we do things a bit differently in some ways compared to Australia.
AIP online
you can read it all free on that site, no need to pay for a printed set.
I cant be much more specific about differences, I havent done enough VFR flying both sides of the ditch to compare. Some of the instructor types around here probly know more. If you are travelling IFR though, there are major differences in Visual Approach criteria, you'll find NZ much less restrictive than CASA in that respect. Have fun!
turbolager.