welcome to the board, great place with a lot of people who know their stuff!
I guess my first question would be what kind of tank is it. Is it and all in one tank with the equipment included or is it a regular tank that you will have to add equipment to? I dont know if you had read much about live rock but I would check it out, l/r is a great thing to have in your tank and it helps with filtration. Also do you know if you are going to use crushed coral, live sand or bare bottom? when you go with corals you cant use stock lighting so there is a lot you have to check out with that.
It would help a lot if you could give more info about the tank and maybe things you would like to keep also what type of corals.
I would suggest that you keep reading and asking questions, the more research you do the better. at the top of this forum is a list called 101 tips, that would be a good place to start. good luck