Being a hockey fan I thought that ND looked familiar (although it doesn't look like the arena I've seen on TV)... If you're newer to shooting sports it seems like you were able to freeze action and keep the images sharp.
Our local arena gets invaded by monster trucks every year but I haven't gone to the event or tried to photograph it. I've found that when shooting hockey the ice seems to help with the lighting (as it reflects it) and when I have done indoor events in the same arena the lack of ice seems to make the lighting that much worse. Our arena does the same thing for smaller events (like high school hockey), opens up seats on only one side of the arena. Which works for them, for the ushers and security staff, but gives you as a photographer a background that looks like nobody showed up!
Since you were able to accomplish what you wanted the next step might be to start looking at other aspects of your photos. You might want to notice how you're framing shots and make sure everything looks straight. I think in sports there can be a lot of posts, lines, signs, etc. in the background and I usually try to check to make sure those look straight. I often frame it so a post etc. is out of my photo when possible or whatever should be straight is parallel to the edge of the frame (such as posts in the glass, not the curved boards for example). Obviously for this type event you've got the rows of seats and banners etc. to think about.
With your photos if you made copies and did some straightening and cropping it might improve some of the shots that could use it, just a slight bit can sometimes make a noticeable difference; you might also think about if you'd want to crop any of them to elminate some of the background. Next time you photograph something like this you might want to notice how the background looks since you've gotten the subject itself photographed nicely.
I learned to make my eye move around the viewfinder to see if everything in my frame is what I want in my photo. If you can change your vantage point you can move something in or out of your photo, but I don't know how much of that would be possible as a spectator. When I was taking pictures at a game where I didn't have credentials to be at ice level or didn't have the ideal vantage point, I'd try leaning to one side or scrunching down or whatever I could figure out to help me frame my shot better (or go sit briefly in an empty seat!). I have found sometimes at games and events there may be some flexibility in letting you stand briefly in a tunnel etc. to get a few photos from a different vantage point.
If you've been able to get these shots in low light (and I know how much difference that can make in older arenas) you probably will be able to continue to develop techniques and work on composition with practice. You could try
Sports Photography and Photojournalism for Professional Photographers and Photography | SportsShooter.com and search articles etc. although I don't think too many people on there shoot motorsports. I haven't been on this board long myself and you've already found out how it can be on here, which seems to be somewhat the nature of message boards. I don't know offhand of a good sports photography site where you can get photos critiqued and get feedback and suggestions, but if you keep practicing you'll probably see your photos continue to get better as you go. Good luck with it.
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