First decide whether you want to fly with a FAA or JAA licence.
If you hold a EU / UK passport, then a work permit in some shape or form is required in the US. See various other threads for your guide.
Can you be certain of employment once the initial training is complete?
If you cannot afford a proper long course, as provided by say Oxford, then consider a regular modular course.
How do you know that instructing will suit you at this early stage?
The bottom line - think about the other options available to you.
Take care junior birdman.