Teigyr - for your first triathlon, I would try to use a free program off a website. I think beginner tiathelete has some:

http://www.beginnertriathlete.com/cm...?articleid=376

maybe trifuel as well:

http://www.trifuel.com/triathlon/tra...ers-000060.php

As for books, my favorite is "The Triathlete's Training Bible" by Joe Friel. This is very detailed and goes through a lot of physiology etc. I do think it's a good read for a beginner, but just read the first few chapters in order to understand the theory on how a plan is laid out and how to make a triathlon plan fit into your life. The chapters on how to design a program would be way over the top for a beginner.

Have fun training and keep posting questions when you have them.