How to use GAIA
I am really close to out of time, but I will update my document later. Here goes a few things:
The Spawn MENU on the top left comes the most close to the 'old way'
By 3D editor
It is now possible to give control to the AI at a later stage. So go to the 3D editor by clicking ALT-mouseclick on the map of MCC. Spawn a unit.
The user interface holds a button 'Give to GAIA'. If you click that button then the group you selected on the map will be under control of GAIA. It will go to the zone that is selected (on the left of the button) and in the behavior you selected (aggressive, defensive, fortify).
The next part is GAIA cycles.