First off, welcome to the forums!
Before I get into equipment, let me give you a tip:
Make your son use his off hand. For every pass he does with his right, make him do one with his left. He may hate it at first, but years from now, he will love you for it. Having two decent hands is better than one good hand.
Anyway... as to a head, you're not going to want to get him a very pinched (narrow) head. Getting a somewhat wider one will ease with catching, and enforce fundamentals with cradling. The STX Proton+ is a good head, as well the Warrior Mojo. If you hunt around a little, you can find them for pretty cheap.
With shafts, it really depends on how much you want to spend. I'd get him something in the 50-60 dollar range. Not too expensive, but enough money to get you something decent. Maverik's Gravity and STX's Vanadium are both pretty nice, but for an extra 10 you can treat him and get the Gaid db803.
Again, make him use his left hand, it's really going to help him in high school. Good luck finding the gear, and I hope your son sticks w/ lax- it's really fun at the higher levels.
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