I got the Kalmbach book "DCC Projects" and it helped a bunch. I had no clue of all the things I could do with my new Digitrax system until I started reading that book and I'm still learning.
You might want to pick up one of the Kalmbach books about getting started with DCC.
You need to start by learning what DCC is and how it works:
http://www.tonystrains.com
and read his DCC For Beginners tutorial
I'm thinking about moving to DCC, but I was curious as to what I need to run two locos at a time. I know you need DCC equipped locos, but I'm clueless as to what else and what brand to buy.