Find a game (check the games and events section). Contact the admin running it and ask if you can spectate or join in.
Some are strictly 18+ others are 16+ with rules and restrictions (eg. some may require parent playing with you on field, others just the parent has to be on site, and even others that just need your parent to sign the waiver). There are even some places that let younger play but they're few and far between, I can only think of 3 groups and they're all in the west.
Also for gear and such there's no restrictions, parts, depends on what it is, batteries and chargers are all fair game and repairs/workshops are OK too.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE