Setting up a computer

Heya Guys!
I need to change my computer case (P4), but I know no more than adding new pieces and removing old ones, cleaning the CPU fan, changing PCI cards!

Where can I find some sort of infromation (a document or a site) that could help me with all the details of how to setup a whole computer up from parts ?

Thanks in advance! :)

THG always works http://www6.tomshardware.com/howto/20020904/index.html

Wow, thanks! :D

Or HardForum.com and Anandtech.com

Many thanks!