Some examples addressing the most common topics/problems:

1. "Hello World"' or "Try to get a simple script running before you  attack the difficult ones !"
2. Turning on debugging information  !
3. Accessing  files or "Are you sure you know where you are ? (in preparation)
4. Uploading files using HTML-Forms. 
5. Sending Mail from a CGI-script !
6. Using Perl-modules that are not in the standard Perl distribution
7. Connecting to a Database (using DBI)