KZ750b twin bare bones wiring help needed ASAP!

Hi guys! Just aquired a bobber project 79 750 twin from a buddy who gave up on it. The wiring is a cob job from the guy who had it before him! can anyone explain this diagram better? Idk what colors to use out of the ignition cuz I got blue, red, white, yellow and brown?! And does power go from the regulator first then starter and ignition? If someone could give me a detailed step by step that would be appreciated greatly! Thanks guys!

media.photobucket.com/image/kz750b%20dia...n/wiringdiagram3.jpg