no i am a banker. If you would like to operate in nyse, nymex, GS or any hedge fund firms, you need to first get a lot of connections. attend a lot of charities sponsored by wall st traders. Usually there are periodical magazines for traders that sponsor this type of charities, like wall st. boxing match.
I do not know how difficult to get a trading job for non-us resident. I think it's going to be difficult, because there are competition to secure a spot. Unless you are an phenomenal, and company nowadays are inclined to employ national. 20%-30% yearly return...