Firstly, the Plains are all 1/1 Soldier tokens (toying around with the idea of switching a number of them out for 1/1 flying Bird Soldier tokens, for extra benefit with Aven Brigadier and making it harder to deal with them!)

Special rules for individual cards:
Martial Coup: X is always 5 times the number of players.
Mobilization: On each of the Horde's upkeeps, it makes 1 token per player.
Eldrazi Monument: Always sacrifices a token, if it can't, the Horde sacrifices the creature with the least power.
Conqueror's Pledge: Always kicked if there is more than one player.
Archangel of Strife: The Horde always chooses "War".

And finally, if the Horde's creatures have vigilance, they always block on a 1 for 1 basis, starting with Tokens (blockers) and the creature with the highest power (attackers). If there are still available blockers after all attackers have been blocked (if possible), extra blockers will only be assigned against creatures with trample (non-token horde creatures will never "double-block").