Installing program in Centos 04
 

- hey guys im new to CENTOS 04 is there a package synaptic manager for centos like in ubuntu.

Yep, but yum is the preferred choice and is installed by default. The apt and synaptic rpm packages are in the extra directory.

yum install apt synaptic

http://www.centos.org/docs/4/html/yum/

- will yum works of the network is disconnected or its LAN is disabled.

As long as you have a local repo configured or use the localinstall and/or localinstall options, yes.

- how do i install firestarter using YUM i found a guide in the net but cant understand it. it doesnt even say how to install it.

For yum, read: http://www.centos.org/docs/4/html/yum/
For firestarter see: http://www.fs-security.com/docs.php

Firestarter rpms for RHEL4 (CentOS) are here: http://www.fs-security.com/download.php

Download and install (as root) for example:
rpm -ivh firestarter-1.0.3-1.i386.rpm