This is the first time I doing this so for many it is stupid questions but I need some help. I have installed CentOS 5.1 and ISPConfig 2.2.21. Everything was easy and working. Now I have a domain name and want my server to have it (what else) Do I need a Dyndns client to get my new IP (I get a new IP everytime I restart the server)? How do I config everything in ISPConfig's DNS Manager?
You can not use the ISPConfig DNS manager for dynamic IP addresses. Just install a dyndns client and configure the dns settings for your domain on the website were you got the dndns service from. Then just add a new website for this domain in ispconfig.
