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On an HL map, it's not difficult for everyone to play at the beginning. Each castle has a specific monster that can be used to defeat everyone needed. For Necropolis, on the first week, you build either Liches or Vampires; for Fortress, I personally use Mages and Golems, although on the second week, Nagas appear, and sometimes all the units in that castle appear without upgrades. As for Elementals, I hate them as a town. I only use them as a university when needed, and if you can buy many of them on the map, then Phoenixes.
All of this is, of course, on the maximum difficulty level. If you set the monsters to the most difficult level, it will only slow you down for a week. So, I don't worry about it too much.
And against a human player, I think it won't be difficult to develop. There will definitely be at least 4 weeks of freedom, in my opinion. At most, a light rush to check the territorial situation.