Can anyone tell me how to make a Integratable map?

I just want to make a map for my game, and have it display in a GUI window. It is a top-down tower defense game and its map spreads pretty far. I just want it to be similar to the command and conquer generals map, and show the enemy units on the maps as a dot.

If you are referring to the minimap on the bottom left hand corner, a very basic way would be to have a second camera pointing straight down and rendering the scene from a top down view. You would probably want to use a layer mask so that the camera ONLY renders what it needs to, like the terrain and the units.