Hello & welcome, Hans. Yes, without the instructions or any tutorials it will likely take a LOT of trial & error to achieve anything decent in CC, but like Gameprinter said, give it a shot anyway. You may also want to poke around here & make sure that learning GIMP (a free, general image software vs. a specific map app) may be a better investment; look at GIMP maps & CC maps & decide which you'd rather use.

Welcome, and I hope you find lots of help & inspiration at the Guild!