How to add a affiliate at my site

I'd like to add a affiliate to my site ,if i didnt use WPMU marketpress and others ,I just wanna affiliate for my stand-Alone WordPress.

I would like my every user have they own affiliate link,then they could share for others,when the customer come with their link referral ,then the sales will count for the referral.

What should i do ? because in the affiliates dashboard just have a simple menu like "Affiliate System Administration" just show little field ,I cant find how to create a affiliates page . Do you have this documentation about how to setting ?

Thank you