System administration question

[Mitja Podreka <mojdebian@gmail.com>]

hello

As I'm very new in system administrating and not an old Debian user 
either, I would like to ask you for some suggestions about system 
administration.
I have six identical networked computers running Debian. All the 
computers are new and powerful enough to run all the necessary applications.
Question: how to administer the computers centraly (install new 
software, change settings,...)? What programs or technologies should I use?
A simple explaination or link will be more than enough.

Thanks,
Mitja