Welcome to the Guild Dave! Sounds like you are a well traveled man. Let us know if you have any questions about the map-making process. Best advice, check out the tutorials section, find a style you like, obtain the software needed, and then just start playing around with it. Be sure to put up a WIP of your early work since this is a way to elicit constructive feedback and tips from more experienced guild members. Anyway look forward to seeing you around the forums.

Cheers,
-Arsheesh