To start an eCommerce business, the first step is choosing the right platform, such as Shopify, WooCommerce, or Magento, depending on your budget and desired features. Next, identify a profitable niche by researching market demand and competition. Selecting the right products is crucial – they should be high-quality and solve a specific problem. Don’t forget to establish a solid branding strategy and create an SEO-optimized website to attract organic traffic and increase visibility.