Might be too late, but never hurts for future reference.
1. When shooting through fence, use long focal length to lessen the Depth of field. Go to aperture priority and choose the lowest you can get to, 5.6 or lower and a high-ish ISO. Make sure the SS is 250 or more. Or you can just go manual. Be mindful of clouds and the light.
2. If focusing on batters, shoot from 1st base line unless they have a bunch of left-handers. This goes for shooting outfielders and third base as well.
3. If focusing on runners, shoot from 3rd base line so you can catch a slide into second base. Of course, if you want to get the fielders instead of the runners, you shoot from 1st base line.
4. Pitchers look great from about a few feet to the right or left of the batter.
5. Coaches, Umps almost never mind a photog to come into the dugout and shoot from the little opening in the gate. Sometimes the ump might get pissy about it, but it's always worth a try.
6. Shoot with both eyes open so you can see the action. You don't need a fancy camera with 1,000 fps if you know how to anticipate and time the action.
7. Tilting the camera a bit when shooting will give an extra bit of dynamic action to the shot. Of course you can do this in post as well.
8. Shoot manual focus if you can. Fences and backstops will ruin an autofocused shot quick.