I suggest you to sell your tank and buy a setup from someone who is getting out. Also make sure the tank is drilled like originalozzyo suggested

selling
 

Ya i was trying to sell it at one point but i never had anyone who was extremly intrested. and i dont think i will get that much for it and then i will be in the same place anyways thats why i was trying to just turn it over and make it saltwater.
and has for having in drilled, I seen a video on utube of a guy setting up a 90g tank and he had a built in overflow box set up in the back of his tank. and it seemed to do the job with no problems.
so ya.
but what do i need to just get started?
i know i need a skimmer, and my rock.
someone also said to have a powerhead.
thanks for all the help everyone.....

I bought my diamond drill bits off ebay. They work great, just set on low speed with the drill torque setting at the lowest point so it won't bind and away you go.

Have you read a book yet on the subject? You'll save yourself a lot of time asking simple questions if you do a little research before hand. Not to mention confusion and frustration...

This article recommends a few good ones. Not listed is The Reef Aquarium Vol 3 by Delbeek and Sprung which is my all time favorite. Most other books just brush over the process of setting up a tank while that one goes into some really good detail.
Building a Proper Marine Aquarium Library
http://reefkeeping.com/issues/2008-01/tips/index.php

reefkeeping.com in general is great if you want free literature. All of their articles are indexed here: http://reefkeeping.com/issues/subject/index.php