I haven't been on this forum for quite some time, but thought I would add my 2 cents. Hockey shots are ok, should be cropped much tighter, too much empty space. Shooting through the netting is not an issue, depending on the lens, if you shoot at 200mm-300mm it is not a problem. Shooting through the glass is only a challenge if it has a dark tint or it's the cheap glass. You can usually find a pretty clean spot to shoot through in the corners. As for selling photos to players, don't be surprised if no one buys, people like to look at themselves, but they also like free, and it doesn't matter how amazing the shots may be. If just are using gear that is capable of a higher iso, use it, you're not going to stop a lot of action under 400th sec, faster the lenses the better, as people have mentioned, 2.8 is good. I try and shoot around 3.2.
Just practice, and enjoy, don't get frustrated if they don't look like they are what you see in the magazines.