Another thing I'd add, is don't make any assumptions, even if he thinks he knows what he wants to play.
I didn't know anything about fingerstyle until much later, and as it turns out, it is something I wish I'd spent more time developing when I was young. I was just unaware of it, or that I would like it.
Once I finally ditched the pick, I was actually able to play Babe I'm Gonna Leave You. I was like, DUH!
I've even learned some Paganini, and gone back to my etudes from my clarinet days, and messed around with them on guitar. (Totally out of my league!)
SO many choices out there!