i think php is a good idea to get started with. things you learn with php will definately carry over to c# later.
http://www.php.net/downloads.php
go there and download/install PHP 5 windows installer.
open up notepad and paste the following code:
PHP Code:
<?
phpinfo();
?>
save this file as: index.php to your web directory.
then try to pull it up in your browser:
http://localhost/index.php
if it prompts you to download, then try to restart IIS. if it still trys to download instead of displaying all your php information, .. then post the problem in the PHP forum
i'll continue to help you get setup there.