Step 1) Find products that people really want, many affiliate marketers simply promote products that people do not want.
So find out what people want.
Step2) pinterest is a visual platform, so infographics work very well. Find the product you want to promote
Search for key features, and then hire someone to create an infographic with product images and key features.
Do not just create 1 infographic, create 4 that have a different angle for this product. Each infographic can have different colors, so you will attract different types of people for the same product.
I hope it helps