The path to Sendmail is: /usr/sbin/sendmail

The path to Sendmail is: /usr/sbin/sendmail
The path to Perl is: /usr/bin/perl
Yes, we have a variety of Perl/CGI and PHP scripts that you can use.
Yes, we support MySQL. You can manage your databases from within your web-based control panel.
Yes, we do support Perl/CGI and PHP.