If not, is someone willing to guide me on creating one ?
There is already alternative units to choose from in the campaing game. The idea is that players choose from the units that are allowed in the campaing before battle as in the campaing, creating a unique roster for each game.
It would also be good to be allowed to alter the unit and upgrade costs, to balance the map.
I have never attempted to create a map in Starcraft 2 so i am new.