Nice sharp photos, third one's a great moment of the coach and the kid. Next time go early, figure out good vantage points noticing what backgrounds you'd be getting - you want to minimize objects that aren't part of the picture (what's happening) but are just cluttering up the photo.
I think one like the first can work to frame the subject with something in the foreground, but for this it would have been better without the other kid. I'd like the one of the coach without the red & black thing hanging on the fence and a blurry kid in yellow, it makes for two things drawing the eyes in opposite directions - flipping the camera vertically might have been better (as his hand is slightly cut off).
I think the one in B&W could almost have made for a picture using the guy in the background watching the game... but as it is he's just a blobby gray and white thing that's cut off. In focus with one kid that could be a picture. Otherwise take a step or two and adjust your vantage point to keep that guy out of the frame.
I've mostly done hockey but found it took a lot of practicing, so the more you keep at it and become aware of backgrounds and vantage points and framing, the more likely it'll become second nature to think on your feet and make adjustments as things happen.