I dabble with CC3, but I know that you must read that little "READ ME FIRST" guide that came with CC3, it makes you're initial grasp of the application much easier.
We have a few CC3 tutorials here, but only a few. The best advice I'd say is to start creating something then post in the appropriate WIP Forum. No matter how bad you think it looks, just post it. Let the experts here critique your map and give you some solid direction on what to do next.
So just read up on some tutorials and make a stab at your first map and post here for critiques and comments.
Welcome to the Guild!