By the DMZ, I mean a third zone. The first being the internet zone, the second being the LAN and the third for hosts that are exposed to the internet, such as an FTP or Web server.
It has been years since I used Mandrake Linux. I remember that if I installed a wizdrake package, that there would be GUI config wizards in the MCC for servers such as Samba. I don't remember whether there was one for an FTP server. The ftp service shouldn't need a lot of maintaining anyway. Several people have posted there favorites on this site so a search may be fruitful. You might look into webmin for maintaining the server. It will allow you to configure via a web browser and not need to install the xorg server.
You might want to pick up a book on Hardening Linux before you offer a public service. It will cover such things as which programs to uninstall, hunting for suid programs and running services in a jail.