Just a quick heads up. If you intend your map for print, there are considerations (such as the resolution you draw it at), also decide if you're map is going to print in colour, greyscale or black and white.

Greyscale is not just black against white but incorporates greys as well. If all you have is black in on white paper you need to be a little more imaginative about getting 'greys' like using spots of black.