* The power of an archmage is 3 * magic science level (50% against dwarves).
The Strength of the units are shown as Offence & Defence. Offence is how good the unit is at attacking and killing while defence is how good the unit is at defending.

Each peasant provides 0.05 defence.

+ The buildings can have various bonuses that makes them more effective and can produce more. For example building farms in a city placed near a river will produce more food then a city on the plains/desert.

The production in each building will vary depending on the total amount of that building in your empire. While one farm might produce 20 food each day, ten farms might only produce 100 food each day.

* All buildings can store an unlimited amount of resources.

Every farm, mine and lumbermill needs 5 workers to operate.

Each man and woman (not in an army) eats 0.25 food each day.

All employed peasants pay 1 gold in taxes each day.
As the population of the city grows, merchants and other wealthy people will move into the city and increase the tax revenue.

Articles and guides can be found in the forum.