[@PlatinumSkink] Diplomacy is done over PM's with the necessary players, and I will PM you at the end of the turn/start of the next of any scout reports. If an attack comes, you won't have any time to move over troops, only those that are currently garrisoned there can defend it. 

Theoretically your messenger asking for experiences could reach anyone and everyone.

Overall your post looks good to me, the only note is that the trained units don't immediately appear the turn you train them, instead they will appear next turn.