To use Pinterest effectively, just think about the kinds of images you would love to share/repin! If you're marketing your products, be sure to use clear and professional shots of them. If your photos do not look attractive, the chances of it being repinned and shared would naturally be low.
Group your products around a theme, which makes it easier for visitors to view your products based on their preferences. If possible, create a board of your most popular products! Most importantly, make sure your photos are properly marked up with descriptions and links, which is good for SEO.