First, you need to do some research on your own. Rooting is not for the Kiddies. Once you start down that road, you are leaving the reservation and trodding the wilderness.
But here is the quick-start. Go to
unrevoked and download the latest version. Install it and follow the directions to a tee. Pay particular attention installing the driver correctly. Then follow the UnRevoked procedure. When you are complete, you will have basic Root.
There is more to follow but your plate is full for now. Go now grasshopper and return when your "S" is off.