The one thing I say all the time with regards to CC3 is follow the tutorials
CC3 can make some mean, MEAN maps, but to do that you need to follow the tuts, and once you have done that a bit, you can really start to play with the program.
Think of it this way. Your first time driving a car (especially a standard with a clutch) takes a little bit of time to get it right, to learn how to let the clutch out without stalling, shifting without lurching etc. After driving it around the block a couple of times, you can then take that cross country road trip with confidence.