Current questions and answers regarding the map editor.

That's right. And the manual should be on your computer, in the game folder. There you'll find the "editor documentation" folder, which contains everything you need, including "Description of script functions."
Actually, that's why I came back... I made a mistake – you can also add creatures to the garrison.
AddObjectCreatures(name, creatureID, quantity).
Just to clarify, the names of the hero and the garrison are script-based, i.e., not direct. For the hero, you can find it in the object's properties, in the settings tab. For the garrison, it's in the object's properties tree, in the name field.