You need setup a kickstart install tree. Here is a good guide to doing this: http://www.redhat.com/docs/manuals/l...tall-tree.html
This is if you decide to install via network. You can also make a customizable bootable kickstart cdrom. Either way you need to copy CDROM install tree into the system you plan to kickstart with. Then share via NFS, HTTP, FTP etc if you plan on installing over the network.