Get at least 4 or 5 decoys and put them about 15 yds from you. Don't call too much, and not at all when they are walking in to you.
Try to make him strech his neck, and shoot.
I reccomend Fiocchi copper plated #5's with full choke, good out to 50yd with 3in 12ga.
Although the kid shoots one every year with 20ga mod #6.
If you get them in close enough, they like your spread, it is almost a sure thing.
The first 3 birds my kid got buck fever, wouldn't take a shot over 15-20 yds. Now she is a veteran.