because like you say, I think he's too young to start
playing chords and scales and stuff.
I think you should find some fun stuff to play
so that he becomes interested in playing guitar.
Go to the local bookstore or musicstore or something
and buy a beginners book. Thats what I did when I started
playing at about 9-10, and I think its good because
in those books you learn finger placement, what
certain things are called and so on, and there is
alot of fun stuff for kids to play.
You get a good foundation, which makes it alot
easier to develop in guitarplaying later on.
And another tip: have ALOT of patience.
My guitarteacher had (has) unlimited patience,
He never got angry, he never yelled, I think if you look
optimism up in a wordbook, there will be a picture of him.
I think that if he had been like many other guitarteachers
I've heard about, I would'nt be playing today.
So just buy a childrens guitar-book and have fun with your boy!
I wish you all the luck.