Welcome to the board and to the hobby!
I am sure you will get the same advice from everyone here... read, read, read before you jump in, and go slowly.
This website has a pretty good section on tank setup
Tank Setup That will give you the basics.
You will learn a TON from reading these boards as well. This is the best board I have ever found for the hobby.
The equipment you will need will all depend on the type of SW aquarium you plan to keep... fish only, fish only with live rock, reef...? You'll need to do your research and decide what you are interested in, and how much money you have to spend on your equipment.
Again, welcome!
Katie