If you're at all scarcity-minded, it's important to understand how much abundance exists today. Considering that virtually every brick-and-mortar store has made the transition to an online business, there's certainly no shortage of competition. But there's also plenty of so-called blue ocean. While most might make it out to seem like Amazon is the only company reaping the benefits of the ecommerce boom here, the growth is widespread and across every single sector in business.
Due diligence therefore lies with the buyer. If you aren't familiar with best practices, purchasing a business through an auction site should be approached with some caution. Quality listings are harder to determine, and shill bidding -- the practice of creating fake buyer accounts to bid on the site -- can artificially inflate the price of businesses that may not be worth the asking value.
First you need to secure a domain name for your website. Then find a hosting service. You will want to create content for your website that is easily read and used by potential customers. If you have set prices for your services, it is best to be transparent about them. If your fees are individually based, then state that. Explain your expertise and success in the business on your "About" page. Be sure to have a "Contact" page with your information so clients can get in touch. Once your website is ready, all you have to do is market it.