Ad Coupons or Ad Networds

I like the sound of the concept of “Free Traffic Credits”, ad networks, and ad coupons. However, I’ve never used them and can’t find any tutorials about using them, at least not very easily. Would some please provide a step by step breakdown or thorough tutorial on using this concept to generate sales on an information product? Probably from creating a niche, sending prospects to a lead capture page from ad coupon traffic, and then as part of an email list, following a sale, preferably?