Sorry to not respond privately, but perhaps others might have input on this as well.
I would say then, when you turn 18, go to college and talk to an advisor about exchange programs. That way, you can see if you like the experience first, and then if you do, you can use the contacts you made in France to get jobs and place to live. I think the exchange program would give you a foot in the door and experience. Lots of foreign companies enjoy having American student workers as interns, and possibly after doing that, to hire! As for the legality, you can look up information on how to get a foreign visa and passport:
http://french.about.com/library/bl-liveworkinfrance.htm
The above link looks good to me as a place to start! Do your homework and good luck!