With regard to the use of the undead, the number wins, and the army of the undead will become stronger and stronger as time goes by. Of course, heroes should have good evocation skills. Recruit as many senior soldiers as possible, and then the building of the dead needs a lot of sulfur, so pay attention to collection. Then the undead belong to the race of low attack, high defense and low HP, and must learn to attack. Finally, the early construction and development. I agree with a senior brother above that it is really good to start with Caspar. If you don't know MF in the early stage, you can check some MF videos online, which are all very good.