Nancy-
Glad to see you got some help. I don't think there's any really simple way to do this. Actually, I'm sure there is, but I don't know what it is. I'd take what you already have here and then edit it some more to simplify and clean it up. If you increase the contrast and use the paintbrush to cover up some of the gray areas, you should be able to get something very close to a line drawing. Save some copies and experiment with the levels adjustment tool and other filters.