You are probably unaware that Sept 11th means that being a flying instructor in the US is now akin to saying you are a traffic warden in this. There was massive cancellation of PPL courses which led to many flying instructors being laid off.
As a foreigner working on a limited visa you would have little opportunity of finding instructing or air taxi work in the USA at the moment.
The whole concept is flawed I am afraid. Reading the adverts in the backs of magazines and digesting the blurb these FTO's send you gives a very skewed sense of what will work.
There are perfectly good established flying schools in the UK who can guide you through a modular ATPL for around £35,000. That is the way forward for you I would guess.
Good luck,
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