I made clothing for years. The quilting only started a few years ago. I taught my 4 (2 boys, 2 girls) and my youngest son's best friend how to sew. My son's friend is the one who does the most sewing. He belongs to a Renaissance group and makes all of his own costumes, tents etc. Since quilting is your strong suit start him out with a basic design such as a churn dash block and go from there. For clothing help him choose something he would like but not to complicated. If your not comfortable with teaching him clothing see about classes at a nearby store (although a boy his age may not be comfortable with that) or perhaps someone you know who makes cloths would be willing to teach him. Sometimes you might find a member of your church who would be willing to teach.