Think about what the previous photographer did. You claim she took in 3k, set yourself up in the same way. X per cd. She trained them to expect to pay for a CD, take advantage of that. Collect payments and name and address and send them the cd via media mail. Forget online.
Now, this next statement is not a judgement of your photography abilities, rather it's a judgment on human behavior. If you let them see photos on the web, they'll either be happy with low res for facebook, etc (so watermark heavily as others have said), but once they see them, unless it's Johnny doing something super extraordinary, they'll give them a ho hum and pass
Maybe I can put it another way.
Sell the sizzle, not the steak. A cd of all the great shots of the game plays bigger in their mind before the game at purchase time when they imagine all the great plays Johnny might make; than when they get on the photo site after their team lost and see there weren't that many great plays.