Thanks guys for th insight inside this thread. It answeredmost all of my questions on how to use ISPConfig to work with the sertificates.
One further question. FYI, I used the perfect setup for Debian Sarge. I have heard that you can create your own CA functionality on this system. What are the pros and cons in setting up your own CA? I am completely new to CA and SSL, so bare with me.
Furthermore, can someone recommend a low $ CA that is reputible?