You want you business online but you don't know how to do it. I can come in, make you a website and email server and then show you how to maintain it.
To start off, you need to have some form of internet connection that is always on (cable or dsl are the most common). You also need a computer. Realize that the more capable the computer is, the faster your website will be. Also realize that you are far far better if what you have is a desktop computer. Nowdays I would probably say that any quad core with at least 4 gig of ram (I have 4 in my server) would do.