Here's part 1 of my long-promised Cartography Tutorial. It deals with creating the basic drawing, establishing the tools that you will continue to use for the rest of the process and finally establishing a clear texture that will be applied over the colour layer that we develop in the next tutorial. Hope this helps some people out! I'm by no means an expert, but this definitely seems to be a successful technique. A great debt is owed to Jezelf, who created a similar - though far more detailed set of tutorials from which I was able to develop my own approach. Cheers.
I will post the finished version of this map after I have finished putting together the tutorial!
[EDIT] Part 2, dealing with colouring can be found here: [link]