I think that all the replies to this post have failed to read the part where he says that he doesn't intend to land in France. Since you are not landing there is no need to worry about customs. The only form that needs to be filled is a flight plan and whoever gives you the form or files it for you will probably help fill it in. Thats all there is to it.
Even landing in France for the first time is much much simpler than everyone has managed to make it sound. Simply fly south until it goes from dry to wet to dry again and land on a long black bit of tarmac. No need to attempt to speak the lingo as they all speak English or you can just point and shout.
There seem to be masses of people that want to go out of their way to make every next step in flying harder than it need be, perhaps so they feel important. There is really no reason why a low hour pilot can set off to Africa let alone France. If you feel like taking someone for the first time then at least take someone who thinks it is easy and who encourages you to stretch yourself.