I will second what alex said. I got started shooting shooting my grandpa's glenfield 60. All he ever did was throw cans, bottle's or sticks into the river and told me to hit them.
Nowadys knowing better than that. I would say use some foods like oranges, apples or potaotes. Or you could get some clays and rig those up.
Start him out with the open sights and then move up to a scope.
What on god's green earth do you think your doing?