Hi there Stephanie,

You will need some software that is going to track affiliate sales.

You can get a product for your own site, or use one of the affiliate manager systems.

e.g. clickbank, paydotcom.com .....

I use and recommend JVmanager (Fantasos) from John Delavera.
the original JVManager can be purchased for $97 and works very well.

and there are others idevaffiliate ....?

I am happy to help more with JVManager related questions.

cheers

Eric.