Look on the web for Gerd Schraner's "The Art of Wheelbuilding". It's available as a .PDF download (~6Mbytes) and (IMNSHO) one of the very best treatises on the art. His spoking method is one of the easiest I've ever seen, and doesn't go into the higher-level maths that Jobst Brandt tends to. Sheldon Brown is also pretty good, but Schraner is masterful and simple enough for a bozo like me to easily understand. Good luck! Nothing beats the satisfaction of hurtling down a hill at 50mph on a pair of wheels which 24 hours before were just a pile of wire spokes, nipples, and a couple of rims on your kitchen floor! …and then you start thinking about exactly at exactly what tension you stopped tightening the spokes!
Go for it! …and Good Luck!

- Wil