Welcome to bass fishing Lars,
The really cool part is your doing this with your son, that in it's self is worth the money spent. Maybe what you might want to do is find out when your son's friend is going to the lake and watch what he does.
It sounds like you may have found out how to rig the worm but a good way to rig them is texas rig. If you go to YouTube and do a search on texas rig they will show you how to set it up. This is probably the easiest way for both you and your son to fish for bass, it can be very addicting once you get the hang of it.
Good luck