If they are using Apache web server, they are looking for index.html or welcome.html. Microsoft IIS uses default.htm. Most good web administrators recognize them all. It is a simple configuration file change.
Your index.html file needs some of these elements.
<html><head><title>My web page</title></head>
<body>
<a href="http://somewebsite.com">hyperlink text</a>
<img src="somepictgure.jpg" width="#pixels" height="#pixels">
</body>
</html>
You don't need to upload the file to the web page to test it. From your web browser, use file:///c:/dir/index.html and test in your browser locally on your computer before uploading. I use a Mac and for me dir=Sites. On my Sun workstation at work dir=~/public_html. I use these to create entire websites prior to uploading to the production web server.
Dreamweaver is for wimps, I us vi!

Just kidding. Dreamweaver is a very good tool. I code by hand or use iWeb for my personal stuff.