No paper problem in France ...
I don't really know your homework to sail in other country.
Call your insurance company to now.
In France, our boat has a circulation card, insurance and for captain: permits coastal and CRR (radio).
For Cazaux lake, you must pay a tax at the tourism office (13€/ month in 2015) see attached files.
If you are courageous, you can translate all the attached files, it's your first job before June.
Doc RPP: see page 11 (map)
You could call Laurent SIRAT (captain school sailing of sanguinet) 05 58 78 64 30, he is very cool and will be learn you.
Best regards,
stef