Maybe treat it like hittin' a baseball. Footwork, hitting off a tee, then a moving target.
I'd make sure he could hit a stationary target first.
Footwork is often overlooked. Just like throwing a ball, start from the bottom up. I shoot left handed so my left foot is back and my right foot is forward. For righties, it's reversed.
Once he gets comfortable, then you could try clay pigeons with a hand thrower.
Good luck. Hope this helps.
