Speaking of farms though, what does your population do for you other than level up your city? Do they pay taxes? I know you consume them when you recruit armies.
Are wargs and horses a resource like Ore and Materials? Do you have to research one of the adventuring skills to locate them?
Could someone explain essence in more detail? If I build the +25% essence building do I regen mana faster? If I summon a bear does it use up my essence? Where can I see my essence?
How is babby formed?
What the hell is a sion unit?
I don't think population increases gildar income. However, population directly controls the sphere of "influence", ie the border, which is what decides which map resources you control or not. Also levelling up your town allows you to build new, stronger buildings.
Yes, wargs and horses are resource-like. You can see them from the start, but you need to research something called Mounted Warfare to use them yourself. Once researched it becomes available for units for 1 horse/warg, or in item shop for 100gildar.
Essence is just another word for max mana. More essence does not make you gain mana faster, you still re-gain 1mana up to the cap for each hero with spellcasting ability each turn (so max mana is individual, there's no pool). (also some units have a mana pool for their own abilities). Unless it says when you summon anything that the essence loss is permanent, you don't lose essence. For example, the spell Imbue Hero, which makes an adventurer turn into a spellcaster costs permanent essence, but gives you a huge warning. Also note that summoning spells cost enchantment slots, and I still haven't figured out what limits that. Also you can only have one of each summon. Summons can be great - IF you look after them and allow them to level. They're NOT cannon fodder.
To get babies you have to select an adventurer of the opposite sex and marry it. I'm not sure if your main guy and the wife/husband must travel together to invoke pregnancy (I don't even know if pregnancy is a feature, or if its breeding-by-spores). I know for sure I've had babies pop out when main guy and wife were separated.
I don't know a sion unit is.
@ posts above: the main function of caravans is to build roads, and thus slowly increase the trade bonus to town-produced gildar. Trade treaties give you a set amount of gildar each turn. All real trade is handled through diplomacy, which you can do without a caravan (teleporting goods ftw).