Replacing default icons in Maps

[BlackCatSLO]

Im making mod to replace default infantry, vehicles icons with red and green dots, becouse AA is not some kind of COD. And every infantry or vehicle have to be reported by the AI or human player. And that units that are not seen by the player they have to bee seen on the map on its last location.

Any idea where to start, the scripting is not a big problem for me...

Tnx for help.