1. What us the full path to sendmail?

/usr/sbin/sendmail

2. What is the full path to PERL?

/usr/local/bin/perl

3. What is CHMOD?

CHMOD allows you to change file permissions. CHMOD is used mainly for security reasons.

4. Which mode (CHMOD) should I set on my CGI scripts in order for them to work?

In order for your CGI scripts to work you need to set mode '755' on them.

5. Which mode (CHMOD) should I set on the rest of my files?

You should set mode '777' on files that are not CGI scripts.

6. Do I have to put all my CGI scripts into "cgi-bin" folder?

CGI scripts are traditionally stored in "cgi-bin" folder, but you can store them anywhere else in your webspace without any problems.