I'd start by introducing him to your bow. He might not be able to shoot it but you could go over your bow with him, show him how the mechanics work and then shoot it for him showing him the capablilities of a bow with much practice. See then if it's something he's interested in.

Talk about the bow season, how much different it is and how the deer are in their natural patterns and not pushed like they normally are in rifle seasons etc...

Visit a local proshop and find his draw length and test shoot some lower poundage bows etc...

Someone who has never shot a bow will be weak in the mechanics of drawing a bow. I've seen some big guys fail to draw lower poundage bows...it's technic and practice.

You'll do fine if your love for the archery shines through.