How to setup Firewall and domain on Fedora core 3

[seelan]

Hi Gurus ,

I m new in Fedora Linux , now currently i m installing the Fedora Core 3 in my office . I would like to find out How to configure Firewall and to setup a domain . One more thing do i need to do any other setting because all my clients are running on WINXP . Kindly help on these . Thanks

regards
seelan