I have been playing for quite a while and still get confused about unit upkeep as such I have some questions 
1) What unit types require upkeep and how much do the different types cost to maintain per turn? (for example: Melee units cost 1 gold per turn, Religious units cost 2 gold per turn)
1.5) Is the above nonsense does upkeep function nothing like this?
2) Are Arquebus considered archer type units? (I read somewhere this would make them upkeep free - is this true?)
3) Do none living units i.e Catapults and Cannon cost upkeep?
4) Is upkeep reduced for units in a city?
5) Finally, are the above answers the same for Wildmana?
Many thanks!

1) What unit types require upkeep and how much do the different types cost to maintain per turn? (for example: Melee units cost 1 gold per turn, Religious units cost 2 gold per turn)
1.5) Is the above nonsense does upkeep function nothing like this?
2) Are Arquebus considered archer type units? (I read somewhere this would make them upkeep free - is this true?)
3) Do none living units i.e Catapults and Cannon cost upkeep?
4) Is upkeep reduced for units in a city?
5) Finally, are the above answers the same for Wildmana?
Many thanks!