I mean this in a friendly and helpful positive way.
On the "overseas parks & touring " link there are 42 pages of threads, and numerous recent ones telling most that you will need to know.
Have a trawl through the various threads posted there and on other links with threads on France and European destinations and touring.
And come back to us if you can't find what you need or if you then have any questions.
Good luck and it is worth a read through this sites pages.