Hello everyone. I've read a lot here, found a lot of useful information for myself, but I couldn't find anything about the confrontation between the Drow and the Light factions. My friend and I just started playing the fifth game and are not very experienced in it. We started a GvG map, a large one, 1v1, with heroes. His main hero is a specialist in battle magic, and mine is a specialist in ranged attacks. He will be developing siege attack. We are playing with a minimum of 3 months.

If I understand correctly, the situation is this: against Wing playing as the Tower faction, with a minimum of three months. Then you can skip developing anything.
It would be better for you to:
1) set more or less decent conditions for yourselves (1 month or 2, but definitely not 3-4!).
2) everything PINOCHET911 wrote is correct. But I would change it a little: Sorgal -- main hero, develop his mentorship skill and take some secondary hero, for example, Sinistar, the main thing is that he has chaos, education, wizardry, and ranger skills (for the secondary hero). The main hero can have different options, but chaos is still, I think, preferable to darkness. You can choose summoning, then you won't have to struggle with unicorns.
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Regarding archers: of course, we eliminate them first with a rogue.