Where to Advertise for affiliate marketing?

So i have gotten into online affiliate marketing selling e books. I have wrote a few articles on what im selling on a few popular article sites, and have also created a website using webs.com. But im wondering where else can i advertise my link for my product? Any forums where i can include it in my signature or good sites to make a page or write an article on? Any help is greatly appreciated.

Also a place to advertise a ref link for a ptc.