RE: How much should we teach?
Mo, sounds like you have done well in the basics of bow hunting with your son. My suggestion to increase his knowledge is to find an approved International Hunter Education Association course. This course will touch base on all aspects of bow hunting from safety to game tracking and upon completion he will receive a certificate of completion that meets all the requirements worldwide for a bow hunter education certificate to purchase a license. It wouldn't hurt to have dad attend the course with his son. Even experienced hunter will learn something from this instruction.
Good Hunting...