well midnight I would suggest going to some of the link I will put below. you can learn some from peeps here n the board but it;s good to do some research and then what you might not understand ask about further.
www.homemadeturbo.com
http://www.beesandgoats.com/boostfaq/g2icturbo.html
Hope these couple links might get you started..homemade has some good info from when the guy did his first turbo and what he learned to his current projects...
Good luck and happy boosting...