My son is 11, and I found at 6, 7 and even 8 the best thing to help him learn how to shoulder a gun, hold steady, squeeze the trigger, etc. was a Ruger 10-22. He still loves to plink away with that thing, and it undoubtedly helps his marksmanship with other weapons.
But as for now, he shoots my old trusty Knight Disc rifle for youth deer season and a Browning youth model BPS 20 gauge for turkey and pheasant. I like the BPS because of the thumb safety and bottom eject...good for both righties and lefties. Good luck...the fun is really just beginning for you :way:
NWBuck