A Playstation 3, Splintercell Blacklist, Call of Duty Modern Whatever 9, any other realistic shooter. A couple good Red Jacket classic selections, an AK47 and the AK shotgun. And of course, zombie targets and zombie ammo. When their interest wanes, throw some binary charges behind the targets to give it a "boom", that's what they do on the "reality" shooting shows!
No, seriously, my local shooting range that I belong to, they have a youth program and provide them with jackets, rifles, training, and they actually teach them how to shoot right and respect the firearm. The jackets hang in the clubhouse, NICE shooting jackets (hell, "I" want one!) and their very nice bolt action .22 rifles and their .22 pistols and I think some shotguns are locked up in the safes in there. I suppose having a little orientation from dad first would help, perhaps a decent, fairly accurate .22 of his own, or a good, accurate pellet rifle depending on your situation. If the range provides him with everything, a good pellet rifle may be best for his own to start. Or if he's ready now, or if not later, I'd recommend a Ruger 10/22, as he'll still have it as an adult. Regardless, if you sign him up at a range like mine, he'll be provided with all he needs while he's there unless you get the right gear of his own, which looks expensive.
They stay pretty interested, meeting other kids, being competitive with something that sort of evens the playing fields (the nerds can shoot as good as the jocks as good as the girls --who may do better, truth be told). They're being instructed in the adult world and given a lot of responsibility. It's also fun, kids like to shoot, especially boys. I think they like it, they seem to come back and there's enough of them to shut down whatever range their using when they get together.
These NRA sponsored youth clubs are pretty nice. Look for an NRA sponsored range that does what I'm talking about (I'm sure you have 'em in Texas!) and sign him up. It'll give him respect for firearms and proper training in their use, not the Playstation/XBox introduction to how to use firearms. He'll be prepared for shooting NM and service rifle shoots and the like. I wish I was in one when I was younger, but at least I got to go shooting a lot since age 8 and learned from my father. A bit of both would be best.