Invest in the good quality, correctly sized nipple wrenches. If you can buy a tensionmeter (the park one is pretty decent for the money) do so.

Think "Art of Wheelbuilding" by Gerd Schraner is definitely worth a read for a newbie. Has a very clear, step-by-step guide to lacing and truing. Can generally get it cheap online.

Sheldon Brown also has ok (but not as clear IMHO) instructions:
http://sheldonbrown.com/wheelbuild.html

When building, taken your time. Don't rush it and don't concentrate on any one spot for too long. Keep alternating from radial to lateral truing and every now and then check the dishing.