I know for sure that the secret to success for selling products online is to have a website with a professional look. Besides this blog, I have another website where I share information about shopping deals. I am not sure it looks professional enough or not, but I do my best to give it a good look :D
If you do want to have a professional looking website, you can contact the people from the ecommerce workflow. They can help you create an eCommerce storefront website for a good price. I wish you good luck when you start earning money online.