My parents moved to france 15 years ago and have had a fantastic life, they are part of the local Committee involved with the entrecote(a big party in the woods with about 500 people ,they help set it up with the local french (wooden dance floor put down ,lots of tables put up and help with serving on tables for the 5-6 course meal.
But they are thinking about comming home as they are getting on and if it gets to a point where they are unable to drive they would be stuck as they live in the middle of nowhere in a 200+ yr old mill house south east of niort.
they did have french lessons before they left and if i remember correctly a lady came to the house.
you could look at this website and go to forums and post some questions.....
but above all make the effort to fit in and not just try to find english friends.
http://www.totalfrance.com/index.html
if you go hope you have a great time.