You will need to get a passport, apply for a Visa and work to earn your citizenship.Follow this link: http://www.uscitizenship.info/ins-citize�� This should answer most of your questions. The cost is great, but worth it. I would suggest living in the Southeastern part of the U.S. The weather there is most mild. The north is too cold and the deep south is too hot.
You have a choice. Marry an American or get a job in the US, for which you will need a degree and for which there are no Americans available. You can also get a job in the UK and get transferred to the US. This is easier.