Take it in small bites. CC3 looks very intimidating at first, and it's a very deep program, but it's possible to make some good-looking maps rather quickly. First of all, don't skip the tutorials--they really are worthwhile.

Second, start up a WIP thread and just start asking questions. I did the same when I first started, and I learned tons that way. Here's my first thread:
http://www.cartographersguild.com/showthread.php?t=847

Welcome to the Guild!