I need help

[Capt.Morgan]

So how do i add another race to like a regular wc3 map. Like you know u have human night elf undead and orc. How do i add say naga as a fifth race to a map without making an entirely custom new map. In other words taking a pre made map and adding a new race. I know how to add buildings and that stuff but not sure how to add new race with the starting building and workers auto placed and such.

Thanks