Resetting a HackOSx machine for Windows Install

I recently built a new Hackintosh and I've got an older hackintosh that I want to scrub and clean install windows on. Problem is, I can't remember all the bios tweaks I did x years ago when I installed lion. All I remember is that I upgraded it to uefi...

So to install W7, do I just reset the bios and boot from CD to reformat the drives? OR is there other steps involved?