Hi sowalter,
Welcome to 5 Star and thanks for starting off with some good questions.
First off, entertainment sites are typically a bit difficult to monetize.
So the 1st thing to do is think like your visitors. I'm not a big football fan but assume you are so you should know how they think and what things they'd be interested in.
Tshirts, hats and other sport memorabilia comes to mind. I know CJ has some programs in that niche. Ebay should be good for football related stuff.
For Ebay products you may find that it's easier to join AuctionAds.
See my blog about it and there's an example in the lower right corner of the blog.
5 Star Affiliate Marketing Blogs, Google and SEO Blog » ShoeMoney Launches AuctionAds Ebay Ad Widget
It's cool because you don't have to learn the Ebay API or any tricky stuff if you arent that technical. Just enter keywords to pull the right type of auctions, customize the colors of the ad box and paste on line of code onto your sidebar and it will always show the latest auctions.
Any football fans with other ideas?