Haven tactics.

How should a human city be built in terms of development over the weeks (in terms of unit-producing buildings)? I've heard that for any race, all 7 levels should be built within 2 weeks, although it only becomes possible towards the end of the month. Meanwhile, the enemy already has all the levels by that time, especially on their hero. And another question: what's the best way to level up a hero? I usually play with Vittorio on small maps and immediately fully upgrade his buildings with a tent. This way, he deals with neutral creatures with almost no losses. Then, I wait for what drops. Usually, if a skill drops, I immediately fully upgrade it. Or is it better to fill all the slots at once and develop them evenly?