Hey vmarqui,
Wow! Great plan! How about your poker career then?
I lived in the states for many years. If you want to study, all you need to do is to get a school paper proving that you're not coming to work but to take classes.
I imagine you need to apply and get accepted then the school will provide you with the correct documents.
If you can't do this from Argentina, you need to apply for student VISA (or green card for re-locating). I think you can find out more at any local travel agency or city council.
I also found this on yahoo: http://uk.answers.yahoo.com/question/index?qid=20080130145043AAFP1BQ
See if it helps. Try to google this topic and you'll find many websites who explains the pros/cons.
Ingrid