Ok again your not clear, your saying affiliate schemes
Where you should be saying affiliate programs or networks.
All networks have a wide variety of sporting merchants so its best that you join all of the networks.
Grab whatever banners you can as they change regularly for different promotions etc etc.
Some betting affiliate programs will have specific banners related to team betting etc etc, or the sports shops may have some for specific teams, or just a montage of kits etc.
I would just get some banners in place for a stop gap at the moment, and not worry too much about getting rich.
You need to crawl before you can walk.
It's a big field the betting markets and a very hard one too crack.