Affiliate Marketing Secrets

i have setup adsense account and somehow i added three unit and now i don’t know how to remove them. if any one knows to get rid of them please tell me. Well, the other day i got email for google affiliate and i signed up now. but how does it work, like how to add the codes, do i make another ad unit on adsense for every affiliate. could you please tell me step by step.
would really appreciate