Take all lures/softbaits/soft plastics etc with you, as they are very hard to get over there and if by some minor miracle you found some, they would be crazy expensive. Take your own.
Same with any specialist gear like spilt ring pilers, photography gear. Expect that you will be unable to buy anything like that over there. There are no bunnings warehouse, mitre 10's etc and what shops there are, are often closed and don't do NZ opening hours.
You don't need a guide, walk and cast and you will find fish.
Take some old or cheap running shoes (maybe even 2 pairs) that you will throw away at the end of your trip, Good to use on the coral and offers protection for your toes on the reef and reef cliffs etc. Don't try and wear jandals/sandals as your feet will get sliced to bits.
Take lots of storm type lifelike soft plastics, like the ones from rebel sport, deadly on inner reef species and good fun on light tackle.