There is a good assortment of assets included in the base product. They have a huge assortment of additional assets and specialized tooling to make certain types of mapping easier (for example, the city designer product makes mapping out cities easier). The annuals are an additional source of artwork and inspiration.
Mostly, though, what you need is a bit of patience to work through the intro tutorials. Campaign cartographer is at its heart a cad program with a lot of stuff grafted on top of it and it can take a bit of getting used to if you're mostly familiar with paint-type programs