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Skeletons are like rabbits. Once you get the hang of it :D
So, everyone knows this, but just in case. We choose Galthran, also known as Gosha, as our starting hero. On the first day, we build a skeleton transformer, transform the excess units from the left (or right?) hero, and basically all the units we can get for free. We carefully level up Gosha's necromancy skill. We also level up one or two more necromancers. We eliminate all the weak infantry-type neutrals, avoid ranged units in the early days, and carefully cherish imps. In battle, we use single zombie/skeleton units as bait. We protect the main skeleton stack like a virgin. And if Gosha is offered Logistics, we don't refuse.
Remember, time works in Necropolis's favor!