There are three methods for configuring XFree on your machine: Xconfigurator, xf86config, or by hand. Xconfigurator and xf86config are functional equivalents and should work equally well. If you are unsure of anything in this process, a good source of additional documentation is:
http://www.xfree86.org
Xconfigurator is a full-screen menu driven program that walks you through the setup. xf86config is a line oriented program distributed with XFree86. It isn't as easy to use as Xconfigurator, but it is included for completeness. If these utilities fail to provide a working XF86config file, you may have an unsupported card or you may need to write the config file by hand. Usually the former is the case, so check and make sure your card is supported before attempting to write the config file yourself. If your card is unsupported by XFree86 you will probably want to consider using a commercial X server, such as the Metro Link X server included with the Official Red Hat CD package. If you have questions about whether or not your video card is supported you can check out http://www.xfree86.org for information on XFree86 and http://www.metrolink.com for information on Metro X.