As much as I'd like to recommend my dom 3 K mod I'll have to admit it's not very easy to read through.. (but it has nearly all sorts of uses of commands in it

)
So I'd have to say that when I started modding I always had Sombre's skaven mod opened next to whatever I was typing it has everything you need in it.
The modding isn't the hard part in the end, getting your sprites is (as honeybadger shows us with his tons of lines of code in several mods but far to few sprites (yes this is meant to get you starting HB)) If you have an idea it's put into a mod very quickly if it's a thing that can be done.. or if it can't be done you'll have to discard it just as quickly

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Want a blend of
fantasy and
sci-fi? Try the total conversion
Dominions 3000 mod with a new and fully modded solar system map.
Dragons wanted? Try the
Dragons, Magic Incarnate nation.
New and different undead nation? Try
Souls of Shiar. Including new powerfull holy magic.
In for a whole new sort of game? Then try my scenario map
Gang Wars.