Welcome to the Guild, Immolate!
I do believe you have indeed found the right place - and the only one of its kind. Although its true, many of us are artists, some would argue they are little more than software users who understand the tools they use.
Check out the tutorials, visit the finished maps, view the monthly contests, there's lots to see and do. We're kind of an academy for fantasy cartography so this your first step in learning the art as nowhere else.
Don't worry, you're not alone, most of us have decades of gaming under our belts too, some are authors or "wannabe" authors anyway. We are a community of like-minded individuals.
Post some maps, even if you don't think worthy - that's the best and fastest way to learn. Show us what you can do, and we'll show you how to make it better.
Again, welcome and enjoy your stay!