Create an affiliate marketing library.
Begin with article training since articles are relatively easy to write ... and systematically cover all the different aspects of affiliate marketing. Teach your affiliates -
How to setup things like their affiliate link, rebranding reports, setting up a blog, loading autoresponders, etc.
How to generate traffic to their affiliate link through PPC
advertising, writing articles, posting at forums, etc.
How to build their lists, preselling, copywriting, etc.
Create one new training article each week and walk your affiliates through affiliate marketing from “A to Z” and systematically train them.
Note: A variation on this would be to use other people’s existing articles, reports and other resources as you have permission to do so. The important thing is to create a library where things are organized by category and easy to use.