Aye, the plan looks interesting but quite complicated indeed, so it falls to you to balance it. Well, I certainly agree that the best variant then is to deploy first core troops like zombies and skeletons or ghouls, then something heavier like grave guard or black knights and only then heroes with the most powerful creatures. It will allow you to test the strength of your foe and allow him to advance without much losses, and he still will put up a fight.