This is the general how to:
http://www.sheldonbrown.com/deakins/...onversion.html
This is for measuring your drop-outs:
http://www.sheldonbrown.com/frame-spacing.html
bottom bracket:
http://www.sheldonbrown.com/bbsize.html

I use a 110 spindle lenght and have had no problems getting a straight chainline. My rear drop-outs are spaced at 120mm

I would suggest surfing everything Sheldon Brown has to say on his site. He is a guru for a reason.