One useful tool with Civ5 is some sort of blank hex grid (made up of hexagons in the same orientation as Civilization V does it). So here's a free 24x24 grid that I whipped up. Note that the first image is 3716x3256 pixels, so you may want to use the 2nd link which is only 1600px wide.



Or a smaller 1600 pixel wide version of the same 24x24 grid