Have Backlink Website. Best Way To Open Affiliat Program To It?

I have a website where I do monthly link building. Have some customers on its own but want to expand it greater. I ben with Share A Sale before but to costly. Looking at just giving money for people who order via an affiliate link. Have not broke down the payment yet as I offer different types of links and prices but who is the easiest to set up at the most minimial cost?
Even if I am unable to find a company how can I do this on the backside of maybe trust program.

Any insight would be helpful.