Brandy, this may be a bit late, but I recommend reading this page about the history of Ringer:

http://akronmarbles.com/players_history_the_game_of_ringer.htm

It’s also worth going through the tournament rule changes that happened over the years. Then follow that link to the “Playground” book and give it a read. It’ll give good insight into how Ringer came to be and why it was choosen as the offical game. Ringer is a good mix of all the classic marble games listed in “Playground”. So of all games, I’d say Ringer is definitely one to learn. Then learn some variations on Ringer. The 1928 rules describe Ringer with poison shooter rules (this is my favorite, and I think it’s most classic). If you want to teach playing for keeps, then I’d recommend Ring Taw (as described in “Playground”). It’s like Ringer, but the rules are simpler and the higher stakes gambling, I think, is more fun.

Other than that, I think Bocci with marbles is fun. Also, golf is a fun game too. Here’s a really simple made up game (like golf). I call it Regatta. Just put two pins in the ground. Start at one pin and shoot towards the second. When you hit the second, you turn around and shoot back at the first. When you hit the first, that’s one lap. Set a game to be a specific number of laps and be the first to finish. I use this game to practice my aim. When playing with others, if you hit someone elses shooter, you get a second shot. Set the pins far enough apart such that it’s a par 2 course. You only need one marble to play