The PerlMonks' Tutorials section includes the Web Programming section which may help. In particular the two HTML::Template related nodes and using CGI, DBI and HTML::Template (a mini tutorial with example code) are worth taking a look at for page generation information and general CGI use.

CGI Help Guide and Troubleshooting Perl CGI scripts are required reading for CGI debugging assistance and of course you should be using CGI (or something similar) for doing the communication grunt work.