
hat HTML does is describe to the browser what your Web page should look like. The code says, "All right, pal, put this picture at the top of the page and put this text underneath it and PLEASE DO NOT FORGET to make the background blue" - yadda yadda. So you have to figure out what you want your page to look like, and then put that description into words that the browser can understand, namely HTML. For more help with this, check out Web Design.
Once you have your HTML file (or files - you'll need one for every page on your site) written, you'll need to get it onto a computer that anyone on the Internet can connect to. So you have to have access to a server and a way to FTP (file transfer protocol) your files to that server. I'm not really sure what that means, either, but if you take a look at this lesson you can get the scoop.
That's about all there is to it. You make some HTML files on your computer and send them to a computer that's connected to the Internet. Then everyone can take a look at your stuff with their Web browsers - worldwide embarrassment for your brother! At last!