Welcome to the guild! CC3 is a great tool for making maps. The best thing to do to learn a thing or two is to start up a new wip here on the forum while working on a map. And of course have a look at the tutorials section.
I bought Campaign Cartographer 3 on Sunday evening to create maps for an RPG I am in the process of writing.
Im hoping to learn how to create awesome maps and maybe some new friends (you never know :p)