Brandon:
Generally look good. If you have the $$$ the 300f2.8 is a beauty for baseball. If not and light permits, throw on a 1.4 extender to the 70-200 and you will be a bit happier with range, but will lose a stop of light.
As to the images themselves, a few specific comments:
1. Nice mascot shot
2. Really nothing happening here not sure why you selected it, it'd be a delete for me
3. Nice shot of the toss...would like to see next frames in sequence of SS going to bag and then runner sliding in to break DP if that was happening
4. Lots of folks here seem to like bat on ball (BOB) shots but 99.9% of time you don't see the batter's face. sports photography is very much about faces and expressions and as I don't see those here, it is not one for me. Try and keep shooting batters as they follow through on their swing and bring their eyes/face up to follow ball.
5. No face, no real action, kimd of a ho hum photo
6. Not bad action, but missing faces (tough sometimes I know depending on your position)
7. Now we are getting there but what was your position, imagine how great this shot would have been if you were positioned more behind first base and shooting toward second. I'd also crop this much tighter to remove most of bottom grass as well as fielder on RH side.
8. Not a bad contextual photo. I think we all understand that the batter probably struck out, would have been better perhaps a split second earlier and with more of ump in frame ringing him up.
My sense was you were shooting from spots generally closer to home plate? Try and move a bit further down the foul lines and this will give you better angles on batters at plate, as well as on plays at second and also pitchers. Where permitted and possible, I like to be just past first or third for probably 90% of the shots I take.
Keep shooting a posting!