How do I organize a co-op?

The easiest way is to use Contact Manager. Send a message to the affiliates you want to invite to participate. Explain the type of advertising you're going to do, how you will set up the co-op (whether they'll receive an equal share of affiliates generated or a specific quantity of affiliates, etc.), and the cost or requirements to participate.
For more information about using the Co-op Manager,

see: https://www.sfimg.com/Resources/TLCoop.sfi