An affiliate network acts as an intermediary between publishers and merchant affiliate programs. It allows website publishers to more easily find and participate in affiliate programs which are suitable for their website, and allows websites offering affiliate programs to reach a larger audience by promoting their affiliate programs to all of the publishers participating in the affiliate network
Gaining enough information by browsing the affiliate program directory before engaging in any sort of agreement with an affiliate provider is considered to be a must.
You can use general shopping cart website to promote your watches on it and sale any of your products in it. i also think click bank is the best option for that.