Working in america help?

Hi i have a dream of going to live and work in america.. to new york in 5-6 years after my education and to work there. I wnat to do a advertisment job and well atm im in college (i live in the uk)and im researching stuff about how i am goin gto get there and to succed but really i havnt had any luck, i know i need a visa and things but im thinking of doing my 3 years at college then maybe going out for experience then maybe trying to get a job offer from a new york media company, would that work? sorry i just want to make sure it possible and also wnat to make the right path to actually achieve it, does anyone know any sites, tips.. maybe go to uni? thanks :)