Stats for 10 yr olds????

Get a copy of the official rules of baseball. Go to rule 10.0. That's the scorekeeper's rule and will explain nearly everything you want to know. An additional feature is, it tells you how to compute the required stats.

As for you question about 10 YO's and stats, that something else again. Personally, I kept stats for our teams, but not until they got into LL Majors. Quite frankly, IMO, the level of play in anything below that is so poor, the stats literally mean nothing.

Now if you're talking select teams that can generally catch, field and hit with fair regularity, that's a bit different. But for normal, run-of-the-mill rec ball, don't bother. The arguments aren't worth the trouble.

On the other hand, if you're bound and determined to do it, just keep basic stats. BA, strikeouts and walks. Stay away from RBI's, Slugging %, doubles, triples, HR's, ERA. To do those things correctly, you really need to know how to keep score correctly. And since it sounds like you'll be doing the stats after the fact, you really don't know if those things were correctly kept and they are almost impossible to do unless the book is very detailed.

This would be a very good time for you to practice for next year though though. Get creative and do some things to show the kids how important some of the things they do are. I've always kept track of the walks and HBP that scored. Showing pitchers how many of those guys score can sometimes make them understand how important it is to throw strikes.

Another good one is to track how many times a batter got on, regardless of how. Strike out per plate appearance is another easy one to do.

Just remember that once you start keeping stats, the players will from then on use that as a baseline. A lot of children and their parents can't deal with a player batting .900 one year in minors and then .400 in majors. They think they are getting worse when all that's happening is that reality is setting in, and they quickly lose enthusiasm. When that happens, some will just quit and migrate to another sport where they can be "successful"!

IOW, don't be in a real big hurry to make them feel like they are heroes! Success in baseball as a hitter is failing less than 70% of the time. Don't be too eager build up a false impression!

With all that said, I think if they are handled correctly and honestly, stats can be a great tool to show the players how they're doing and to help them set goals for themselves.