you can get the dhcp rpm for red hat 9 here (it should also be on your cds):
ftp://mirrors.kernel.org/redhat/redh...l1-23.i386.rpm
here's a little tuorial i found for you, you can find more by searching
http://www.google.com/linux
http://www.troubleshooters.com/linux/dhcp.htm
basically, the configuration is done with file /etc/dhcpd.conf, and on most distros you need to create this file yourself...
there's plenty of examples of actual working dhcpd.conf files floating all over the web...
if you want, you can ask for an example on this forum...