Hi weave,

Your best bet is a 22. Then teach him position shooting and he will use the knowledge the rest of his hunting life. The 410 is a very poor choice for a first gun. The 410 requires precision due to it small payload. It might work for squirrels or rabbits but a single shot would be a better choice. Let him learn safety and gun care with an inexpensive 22. There is plenty of time to start with a shotgun. A 20ga would be the best choice when he is bigger and more responsible.

Frank