There are a few ways to open an online store. The two most common ways are to use a shopping cart platform or to build an ecommerce website from scratch using CMS. Both have their pros and cons, and it really depends on your business goals and needs which one is the best fit.

Shopping cart platforms like Shopify, BigCommerce, and Volusion offer free plans that allow you to set up a basic store with limited features. These platforms allow you to add products, customize your layout, and track your sales. Once your store is live, you can use their built-in marketing tools to promote it to potential customers.

Ecommerce websites can be custom built using WordPress and hostied on server like BlueHost, HostGator, or SiteGround. WordPress eCommerce websites are not expensive up front, but they offer greater flexibility in terms of design and features. They also tend to be more scalable than shopping cart platforms, meaning that they can handle larger volumes of traffic and transactions.

There is no one answer that is right for everyone; it really depends on your business goals and needs. If you're just starting out, a shopping cart platform may be the best option because it's easy to set up and start selling products. If you're looking to grow your business, then an ecommerce website might be a better choice because it offers greater flexibility and scalability.