Syslinux - Dec 2005 - distro setup

Hi, I have figured out how to set up DHCP to point to pxelinux.0 and serve 
it to booting client via TFTP...I'm able to set up NFS server and point to 
it within pxelinux *default configuration file...but I do not really know 
how to provide a proper kernal image and initrd image for pxelinux booting 
any given linux distrobution...could someone give me some advice on how to 
go about doing that?