To open your ecommerce store, first you have to create shopify account . To create shopify account follow the below step : 1. Click Here and Fill the form , it will open as below. 2. For the store Name do not use any www or .com on the extension just give the name . 3.Use name as short as possible. As example if your store name is adidas then just Put adidas , no other extension with it . 4. As it will automatically take myshopify.com as suffix , your store name will be adidas.myshopify.com 5.you can add domain later but your this url will be SEO friendly and good for your site . 6.Remember the username(your email address ) and password , you can login later using that username and password . If you have already shopify account you can login with that .