Well, the FF12 map is pretty simple since it doesn't show forests, mountains, desert and all that. So doing a map in that style would basically be sea layer, a land layer with an outline border and then a bunch of grunge brushes to get the washed out look. As for the isometric-looking symbols, you could probably find some on the net. I think you can actually get the symbols from one of the old SimCity or Civilization games, they might fit in nice.