I was sure if I build it, I will get 3 palladins and 3 archers and they apear when I finnish it
This is one of the reasons why I believe that custom campaigns should be released as installers, and not as a "light mod" for the regular war2combat.
At a minimum, when installing the game, a "read me" window opens, where there is a description of certain new items, features, etc. Or a link is given to where you can read about it... Or make a full-fledged training, like in the regular RedMist.
In general, there are many topics to think about. We will try to improve and make our future projects more understandable.