Web pages need to be written in a special language called HTML. Unfortunately, most people don't feel like learning HTML, which is where Dreamweaver comes in. Dreamweaver lets you type text in just as you would with a word processing program.
Once you've created your pages, Dreamweaver will publish them on the web for you. In order to do this, you must tell Dreamweaver about your web site, and how to upload the pages.
All of the available Howtos are listed on the navigation bar to the left. If you've never used Dreamweaver, we suggest following them in order, starting with Setting up your Site, which tells Dreamweaver how to publish your site on the web.