Hi cannz and welcome, you have come to the right place! I would suggest you join a club but there isn't one in Kaiapoi
You could join my club, Marlborough. We have about half our members living elsewhere in the country and one in Texas. By joining a club affiliated to the FNZAS (this is their site) you will get the Aquarium World magazine free plus a Year Book listing all the affiliated members throught NZ and a list of retailers offering discount to FNZAS members - plus lots more.
Before you decide on filtration and substrate it helps if you have some idea what sort of fish you want to keep as some filtration and substrates are more suitable than others for some species.
Always follow the KISS principle - Keep It Simple Stupid.
You do not have to spends lots of dollars to have a nice looking tank. Any idea what sort of fish you would like to keep?