Welcome to the CentOS fora. Please see the recommended reading for new users linked in my signature.
You need to edit
iguration files with your favorite editor, then restart the services if you need to make changes. By just entering the filenames on the command line you are trying to invoke them as a command (shell-script or program). As those are the default ports, it does not seem any changes are required. Have you installed mod_ssl and started the httpd service?
Note that the current CentOS-5 release is 5.7. Obsolete releases are not supported. Update with "yum update" as root
to get the latest errata. See the CentOS 5.7 Release Notes
for details. By not updating you are implicitly accepting that you will live with numerous bugs and security issues (and associated known exploits) that have subsequently been fixed.