From reading your post, I'd *imagine* one of two things has happened:
1) You say you created a notepad document. However to show up when you simply go to the domain, the file must be named "index.htm", "index.html" or "index.php" (they are the 3 most common, anyway - it's "index.[something]"). Maybe you simply called the document "[something].txt" and uploaded it, in which case it wouldn't show up unless you went to yourdomain.com/[something].txt
2) When you login to an FTP space, in 99% of cases you simply connect to the 'home' directory, whereas you need to upload all your website files (so the index.[something] file) to the "public_html" folder. So connect to FTP, then navigate into "public_html" and upload the file there.