There are four types of buildings in the game; Civic, military, production and fortifications. You have to construct everything except fortifications - which you already start with, and can upgrade to bolster your defenses.
Construction is pretty much your bread and butter - while you can focus more on fighting and conquere them instead of buildingt everything your self. Those of you who love pummeling your enemies into submission would have to bother with construction less. All crucial development features are based in the capital - so losing cities won’t stop you from researching and arming your units. Expansions are mostly about income and strategic map positioning.
How to construct?
The Buildings menu appears in the right corner at the bottom of the screen after clicking on 
opens/closes the menu.
Production: includes all buildings of resources production.
Military: includes all military buildings such as barracks and workshop
Civic: includes the most important constructions in the city like palace, university and market.
In order to be able to construct a new building in the city, two conditions/requirements must be available:
1. Enough space (expand if need be expansion.)
2. Enough resources by assigning workers.
To start construction, just choose the building that you want and drag it to inside your city and make sure you release it in the green area.
Expanding city walls
You can expand you city by opening the build menu 
and selecting one of the area you wish to expand.
You pay for expansions as any build project.
Simultaneous construction
There are 2 building slots for a city and you can have maximum of 1 waiting queue. The second construction slot you get by simply doing quests.
Speed up construction
Building processes can be finished instantly. Simply click on the building and select 
to finish now.
The amount of gemstones required for instant building differs depending on the time you wish to skip.
Buildings
Production Buildings
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Houses |
Farmhouse |
Storage |
Lumbermill |
Stonecutter |
Smelter |
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The places where you people, work, play and store the goods of the city. |
Military Buildings
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Barracks |
Workshop |
Secret Stash |
Dungeons |
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You can call these part of a larger defeat insurance plan ; ) |
Fortifications (defensive)
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Guard Tower |
Walls |
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Provide protection against enemies. |
Production Buildings
Houses
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Info:
Houses simply provide a place for people to settle in.
Population growth rate is independent of housing and farms.
When you run out of living spaces, the city starts to gather homeless people, they can work, be trained as troops and pay taxes as soon as they get a place to live. They cost nothing and are simply there to preserve population growth instead of cutting it to 0 when your have no room for more people.
Benefits: Population Capacity
Max: 3 per city, level 12 each
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Info:
Farms directly feed the population and provide food reserves for the army.
Population growth rate is independent of housing and farms.
When you run out of farms to feed the people, population growth stops.
The food in your storages is for military purposes only, the people are fed separately.
Benefits: Worker Capacity Food, Population Feed
Max: 3 per city, 10 levels each
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Info:
Running out of storage space in a city halts production from the mines. You can transfer resources to a city with full storage and they will be received.
Benefits: Storage Capacity
Max: 3 per city, 12 levels each
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Info:
Get people working in it and they will produce wood.
Benefits: Worker Capacity Wood
Max: *5 per city, 10 levels each
* There is a total capacity of 9 mines per city, you can have different counts of each type to suit your preference.
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Info:
Get people working in it and they will produce stone.
Benefits: Worker Capacity Stone
Max: *5 per city, 10 levels each
* There is a total capacity of 9 mines per city, you can have different counts of each type to suit your preference.
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Info:
Get people working in it and they will produce iron.
Benefits: Worker Capacity Iron
Max: *5 per city, 10 levels each
* There is a total capacity of 9 mines per city, you can have different counts of each type to suit your preference.
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Civic Buildings
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Info:
Level of the palace controls the number of cities you can have. There is a variety of benefits from the building itself but primarily:
Benefits: Levy Taxes, Colonize/Conquer Cities
Max: 1 (capital only), level 10
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Info:
Across the empire - unlocks researches that improve economy and military.
Benefits: Research
Max: 1 (capital only), level 14
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Info:
Across the empire - improves the damage, life, speed and cargo capacity of each unit type.
Benefits: Armament
Max: 1 (capital only), level 10
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Info:
Choose between different rituals to boost your economy and military.
Benefits: Rituals
Max: 1 per city, level 10
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Info:
Allows you to sell and buy resources.
Benefits: Trading
Max: 1 per city, level 8
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Military Buildings
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Info:
Barracks upgrades allow you to train more units, increases their damage and lowers units price.
Benefits: Soldier Training
Max: 1 per city, level 10
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Info:
Takes wood returns crafted wood that bash city walls. The more you have the better the costs and crafting speed of machines.
Benefits: Siege Weapon Crafting
Max: 1 per city, level 10
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use.
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Info:
Make sure you have something left after you get robbed.
Benefits: Hide Resources
Max: 1 per city, level 5
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Info:
Prevents selected troops from being attacked.
Benefits: Hide Troops
Max: 1 per city, level 5
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Deals damage to incoming enemies.
Benefits: City Guards
Max: 24 per city, level 5
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Info:
The pile of blockage that stands between you and the enemy.
Benefits: City Defense
Max: 1 per city, level 5
(pre-built)
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Keep in mind that the most up-to date information about detailed stats can be found in-game - such as the amount of storage space that the Palace gives...