How do I create a website, cheaply?

So I got this cool idea for selling products to a niche market. However, I don't know the first thing about website design, HTML, domain names, blah, blah, blah… and I don't want to pay a web-designer. I want to do this cheap, not necessarily free, but cheap. What is the best site to help me build my page, that will get me into the big 3 (search engines) and get me noticed, so I can sell, sell, sell? I've been looking at this "buildyoursite.com" and they look pretty user friendly, but I have no clue if it's what I should use… Please, let me know what you think…. Thanks in advance!