I don't know about visas, but the fact that you want to study here will make things easier, I suppose, in terms of long term visas. You should check out the US and UK gov't passport and visa websites for more details.
Do you know the wrestling school you want to attend, or is that an unformed plan? I would nail that down. Also, get some kind of job and save up some money, like $5,000. I know it sounds harsh, but it's going to be easier for you to find a job now at home than it will be here--you don't even know if you will be able to get the proper working papers here.
Then come on over and do your thing.