Useful, interesting, priceless, here are some links you may need.
Knowledge of the French language WILL be useful to you whether you plan to struggle through a convoluted French bureaucratic process by yourself, or simply argue politics or football with the locals. These schools have experienced teachers who know how to satisfy your basic linguistic needs:
A very nice guide if you just arrived in Montpellier. Funny, smart, everything you need to know is here!
Are you a scientist and plan to work in a lab close to the sea? All you need is a fellowship, and it may not be that difficult to find with Ma Bourse.