Troycast:
Your profile doesn't provide the state you live in, so I can't be more specific than to suggest you contact the division of mines & geology (or natural resources or whatever your state calls it) and get some basic information on the rocks and minerals found there. Many states have first-rate museums where you can see the identified specimens. Is there a large public college or university nearby? It may also have a museum.
And, of course, there are the local rock and mineral clubs.
I remember the Golden Guides from many years ago - there are probably better ones out there today, as well.
Take your son to the local library and do a little research.
The most important thing is that you and he are spending time together.
The next best thing you can do is research with him (instead of for him) and teach him how to do it!
Then go out and find some more!
Good luck to all,
The Old Bookaroo, CM