Email marketing remains the best commercial asset to run a successful online business, what you need to do is to start in a niche that have a need and build an excellent customers relationship and send them offers they are interested in.
First focus on a subniche who are desperate and look for a solutions for instance people who suffer from acne are desperate, unhappy and uncomfortable if you show them the product, they show you the money, there is so much involved on this and it needs a step by step guide. I am working on an ebook about that as there is a minority of people who want to understand how to do it.