The best way to promote ecommerce website is through finding appropriate blog and social media sites that the customers in your product space use and visit and then writing something catchy about your product there that could grab the attention of people. If you post the images of your products that will increase the chances of grabbing attention of your prospective customers manifold.

Other than that you can use SEO strategy for this purpose. You can select and use appropriate key words for this purpose through which people will be able to find your product and store through searching on internet.

The other thing you can do is to ask your existing customers to post their reviews on related blogs and websites. You can also provide a space for review on the website of your store. People mostly rely on the experiences of others and positive reviews help in increasing customer base while negative reviews will help you to improve your product.