Here are a few tips that I can recall from the sports shooting talk I was at last week. The lecturer was Matthew White. He's a sports shooter for the Houston Chronicle. You can see his football stuff
here. Despite his protestations to the contrary, he was a really engaging speaker.
1) Shoot with both eyes open. Things move fast and you've got to learn to see through your lens and around you at the same time.
2) Don't bother with a monopod for anything smaller than 300mm. For sports shooting, your shutter speeds need to be fast enough to stop the action, so camera shake isn't a concern. The monopod is just there to carry the weight so your arms don't get as tired.
3) He was really big on ThinkTank belt and pouch stuff for holding gear and keeping it ready to use. I use the Lowepro S&F system, which is similar, but I have to admit that the ThinkTank stuff looked better. You could tell that it's made by people that use it.
4) Take focus off of your shutter button and use the AF button instead. You need to be able to lock focus on a player and then turn off AF when another player is about to cross in front of you (which you'll see because you have both eyes open). You just can do that if you don't have your shutter and AF on different buttons.
5) Don't expect to get rich. He's been doing this for about 10 years and said that he figures that he makes less than 90% of the people in the room during the lecture (which was at our local photo club, not a particularly rich crowd).
6) Like most sports shooters I've listened to, he shoots in manual. That always seems odd to me, but that's what I've heard from everyone I know that is successful at making a living from it.
7) While some old timers use manual focus, he relies on AF. Of course, his camera has AF capabilities that substantially outperform a D40/40x/60 series camera.
8) He sets the camera on max shooting speed and then fires quick bursts. You want a burst so that you get several different shots of each "moment." You want a quick burst because the peak of the action is pretty quick and you don't want to waste a lot of your time going through junk shots before or after the peak.
9) He really hammered home the timelines that sports shooters labor under. Post processing is barely an option. It's cull, crop, and submit. You've got to learn to get it right at the time you're shooting.
10) The biggest challenge today is getting access. You've got to have credentials to be on the sidelines. You've got to have a portfolio and know people to get credentials. It's a hard business to break into. Once you're in, you've got to do a good job and not make anybody mad because it's an easy business to get tossed out from. Unless you're SI, sports shooters carry zero clout, so if you screw up, nobody will invite you back.