Yeah so you can probably get one over there in France but don't bring it back. Once your exchange is done in France just sell it to someone and recover some money.
Backyard shooting is OK... BUT not recommended. Someone may mistake it for a real gun and you'll have EMT on your ass with guns drawn.
Basement shooting is probably better/safer, make sure you're far away from windows though. Find either the longest hallway in your house or something and setup a paper target and BB trap to shoot at.
Regarding rules of playing. generally it's 18+ but in some circumstances you will be able to play 16+ with parental waiver really depends on the club/field running the game.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE