Welcome to the guild!
There are certainly a pile of tools out there these days for the artistically challenged, such as myself, LOL. Much depends on whether you are looking for merely functional or beautiful or a combination thereof. If you have access to Photoshop, as complex as it is, the tutorials here will get you making passable maps pretty quickly. Same goes for GIMP, which is free. Campaign Cartographer is a great resource that doesn't typically get as beautiful as Photoshop-style maps, but it is relatively quick and easy to whip out maps. It has a bit of learning curve, but most things do.
Anyhow, have fun! and beware, cartography can be addictive... just like GMing.