Newbie looking for help.

Hi everyone,
I'm new to this group, and I'm trying to understand how to do
the cnc conversions.
From what I gather from watching this group I need:

a.) 3 stepper motors
b.) a driver card that connects to parallel port
c.) power supply
d.) a pc with a cnc program
e.) mounting hardware

I want to convert a Grizzly mill-drill, lathe.
What I'm looking to find out is what size motors would I need?
Is the power supply a transformer just for the motors
Are there any books that I should get that explain this in simple
terms? Am I on the right track here?

Thanks In Advance,

Bob