If I were you I would concentrate on getting through the tests and interview, then passing the course and validating at a unit, before aspirations of working abroad. There are a lot of hurdles to cross before you should even think about overseas. Also, as previousely said, do not tell NATS that you would like to work in another state. The last thing they want is to spend many thousands of pounds training you for you to flee the nest after validation.
Rgds
ILS 119.5