Ah, I thought I recognized that screen name. Welcome to the Guild Coppermane, nice to see more Obsidian Portal representation here. Yup, I'd never worked with digital media at all before coming here, but with the help of some pretty great tutorials here and a very supportive community I learned it pretty quickly. I have now doubt that you will do the same. The tutorials are a great place to begin. Ravells also has a helpful sticky at the top of the Member's Introduction section called "A Quick-Start Guide to Fantasy Mapping" that is work looking at. Once you've begun working your way through a tutorial or two, it's a good idea to post up a WIP so as to encourage constructive feedback from the community. Looking forward to seeing what you come up with.

Cheers,
-Arsheesh