I think your question is a bit too general to get much help here. Can you be more specific? Since it looks like you're from GB, you won't have much trouble visiting the U.S. at all. Unfortunately, it's the people who live outside of Western Europe who are looked at with a jaundiced eye by our current fatherland security administration. Peruse this site for more info on entry requirements:

http://travel.state.gov/visa/temp/types/types_1262.html