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Please, advise where to study to be a guide and how it is possible to arrange this project.
I would certainly contact the French Government Tourist Office in New York. I'm sure they know of training schools.
HOWEVER, unless you have the right to work in the EU, I wouldn't be terribly optimistic. IF you have a special field of expertise, you might contact some US tour agencies and see if you might do contract work.
I'm not certain ... but I think this field is hard to break into ... ESP. as French tourism is down. The more languages you speak and the more you "bring to the table," the better.