I would firstly think of a niche that I could bring value to. For example, maybe you are a keen camper? a keen meteorolgist? A keen golfer? Keen on boats? Driving? Maybe you are a plumber?
Everyone out there has an interest and is knowledgeable in some area or another.
I would then join forums in my chosen niche and see what problems are needing answered. For example...If I was a plumber I would search through forums where people are trying to do a bit of diy. Someone might be having trouble fixing their taps?
Once I have found problems that need answering I would write a quick 5 page report on various plumbing issues. Within this report I would include links to some affiliate products. There are thousands out there!
I would then go to every forum and tell the viewers a bit about yourself and create a post giving away your free product. They will love it as it will save them searching through tonnes of info.
Before you know it the sales will start to come in.