You don't need anything else to make a usable map with CC. That said, the add-ons can greatly improve the final product by adding different textures and symbols (assuming that you blow up the master map and put in the details for sections).
You can create and import your own symbols in CC, too. So you could use Glorathan Runes for the map.
One warning. It really helps if you have som familairity with a CAD program. CC is essentially a CAD program, but with specialized symbols, and optimized for mapping.
There are some other programs out there too, and some basic computer drawing programs can do some things as good as or even better than CC. I've "mixed & matched" a map or two in the past, when I wanted to do somthing that CC woudln't allow.
Fair warning\this would be a massive project. If you make the map scalble, then all the fine details (coastlines, rivers, mountains) would need to be adjusted to be accurate as small scale, meaning lots, of tweaking. If it is going to be done in large sections (world, continents, regions, etc.) then only one person could tweak a map at a time, since any changes would be saved to one file. So if one person wanted to do the detail map for "East Nowhere", and another wanted to do "West Nowhere", they would have to take turns, or do two different files.
