this link is the best place to start.
http://forum.ppcgeeks.com/showthread.php?t=33857
i followed that to the letter and was up and running in no time. i did get stuck in bootloader but it was because of a step i missed. getting the ESN added will take longer than flashing the phone. you will need to download the PPC kitchen or use DCD's rom. its easy once you start.