loading modules in Fedora 6

[Al Graziano <al graziano gmail com>]

Hello,

can anybody point me to some reading to better understand how Fedora 
loads modules, in which order and from which directories etc., 
especially with regards to Fedora 6. I've read a lot around but nothing 
that gives me a firm idea

I am trying to understand how I can install certain modules at boot up 
and conversely how I can  change a  module from  being installed 
automatically to manually using modprobe. In order to do that I need to 
know more about modules that installed at bootup

Thanks in advance
Al