What computer languages and techniques should I learn in order to create a highly profitable website?

The website, would have members, host audio and video files, make transactions, and probably more. Basically I want to learn how to construct a professional website in my garage, all the setups required, all knowledge that needs to be learned ect…. Where is a good place to start? I am already learning HTML and purchased Dreamweaver. I think I’m going to need to learn some computer programming languages as well. What are the popular programming languages that create small software applications for the web?? What knowledge needs to be learned to start up a computer server in your garage?? Please don’t respond with going to college and getting a degree, I know there is plenty of information on the internet and in books for the knowledge to be learned