Hi there, will be glad to help
There a number of ways to find out the Cost Per Action. What do I mean, this is the cost per sale. This is the total amount of revenue you earn from an affiliate sales dovoded by the total number of clicks. For example if i am Promoting product A from Clickbank, and I have a landing page sending me to product A and I receive a $50 for each sale I make. Lets say I send 100 clicks to my landing page, and I make 2 sales. That is $100. That means my cost per subscriber is $1.00. In general you will want your Cost Per Action To be greater than your Cost per click. So if this is what my data tells me , I would search for a CPC campaign for less than a $1.00.
Now how do you find the average cost per click? easy, just find out the total number of clicks you receive using a tracker (I recommend hypertracker) and find the total amount you spent on the ad. Divide the total ad spend by the total number of clicks, and there you have it your CPC. I always recommend tracking the clicks you receive as you can use your data to make better business decisions. So always track your clicks and your data.
Now all the big ad companies, Adwords, Bing, Facebook have the average cost per click values displayed so you can easily find the data, but I always recommend tracking the clicks yourself.