Establishing a business online isn't as simple as making a website. In this digital age you need to build a website with a solid search-engine-optimized foundation so that your website shows up at the top when some searches for a product that you sell. Asides from that, you'll need to make an account on popular social media networks like Facebook and Instagram then run ads on it to sell your product. All of it depends on what sort of company you run and what sort of audience you want to target.