I can confirm what Scott just said, most of the revenue will come from the side games as it will take a while to earn huge amounts of revenue from the actual bingo games since the player only has to spend 5p on one card.
You will usually find most bingo rooms only offer a rev share affiliate deal but you can always speak to them and see what they can offer you.
There is a fair amount of revenue to be earned from bingo however there are some strong bingo affiliates out there already you will have to compete with.
Mark
UK Affiliate Manager
888.com
888ladies.com