Sounds like he is on the right track and the lesson and experience will last him the rest of his life.
When you go, get to the range 20-30 minutes before the match (it may be busy) but find the match director (they’ll be the one herding cats) , introduce yourself and tell them you want to...
I would recommend taking him to a couple of matches as a spectator so you both can learn together the range rules, the match commands, see how the match stages progress and he won’t be overwhelmed. There is a lot going on and seeing how things progress will make his first time participating more...
When I was hiking the AT I carried a couple of extra pieces for those poor souls that decided to break in their boots on the first 30 miles. Always good to see people pushing themselves, their gear, abilities and expanding their uncomfortable zone. Wear that patch with pride.