the way to get somebody into coin collecting is to get them coin folders, (I mean actual coin collections that you have to fill in the coins by adding them in yourself) and they're pretty cheap I mean like $3 per folder.

here are the folders that I would suggest buying, there ar emultiple companies that make them.

Lincoln cent 1941-1974
Lincoln cent memorial 1959-1998 (much easier to finish than the 1941-1974 but less rewarding)
Jefferson Nickel 1962-1995 (this one feels great to finish I know because I did it.)

I would suggest dimes but I would definitely wait and see if he gets interested first because once you get to dimes the price of the coins to fill up the collection folder get's pretty high considering that it's just a coin collection.

You can get coins a lot of different places I prefer the bank because they give you coins in rolls, probably cashing out $10 in pennies is enough to get a pretty nice looking collection though I'm not entirely sure how many wheat pennies that you will get in just $10 worth of pennies at the bank, I'm sure that you would get some.