The Pet house in coastlands, Kapiti has a small saltwater set up and is a nice guy. In terms of what you need depends on your set up the one thing you need the most is access to lots of information if you havent gone to
I terms of what you need I wont make a comment as I have no experience and you are better off talking to one of the more experienced people about that but trust me the budget will probably be bigger than you are expecting. Although if you were only planning on having fish you might be able to do it on a budget of 1-2K, Possably cheeper '>reefcentral.com I would sudgest you do. I have also found books to be very helpfull but you have to make sure you are getting one written for the begginer the best one i have come across so far is "The Questions & Answers Manual of The Marine Aquarium"
I terms of what you need I wont make a comment as I have no experience and you are better off talking to one of the more experienced people about that but trust me the budget will probably be bigger than you are expecting. Although if you were only planning on having fish you might be able to do it on a budget of 1-2K, Possably cheeper