Itz:
Like Scott mentions above, be careful you are not PRINTING on spec as you may end up with lots of wasted paper. Better to put images on a web site and let parents/players and coaches view and then order from that.
As to number of pictures?? I have been shooting hockey and usually I end up with 400-500 images per game. This does not count many that are deleted in camera between periods. From these, I whittle down to about 60-80 keepers that go up on the web site for that game. All players and parents have access and they can order as they wish.
Your sheet of prices is a great idea. Give them the web site and the price for the sizes of photos you wish to offer. If you plan to offer images on CD, you may limit what prints you can sell in the future because many parents will buy the digital image and print themselves. This may work though for some people. I know I bought a single digital image of my kid in hockey one time for $25.
As to what you want to offer package wise, I have been using a price per 8.5 x 11 sheet, which can result in one 8x10, 2 4x6 or 5x7 or ~9 wallet sizes. This gives the parents some flexibility and keeps it easy to price things. If you are printing yourself, your cost becomes ink and paper, which will be the same (generally) for one size of paper, so make sure you factor in your actual costs and build in some profit as needed.
As a side note, and please don't take this the wrong way, but from what I have seen of your shots so far, especially basketball, you still need to do a ton of work before you have anything close to what I as a parent or player, would be happy to buy. Your last set was great from an exposure point of view, but the captures and crops really need more work to get players faces and key action points. Your track stuff I saw was OK in this regard, but really keep practising the BBall to get some good sellable images.
Cheers!
Chris