History of the tribe
The Atlanteans are a high culture with some unusual traits, both positive and negative. On the one hand, Atlanteans have very good schools and don't need any masters or chiefs, as every person who has learned a job is already very good in it. On the other hand, the Atlantean workers are much more expensive than workers of other tribes.
This schooling and interest in the natural sciences (mathematics, physics, and chemistry) inspires their buildings to be very geometrical and use (besides simple planks and stone) special materials, like spidercloth, mountain crystals and diamond. Atlantean buildings are very simple, useful, and stable. Accordingly, Atlantean mines are much bigger than those from other tribes. They mine in a radius of 5 fields around the mine and only do work in a group of 3 miners. Consequently, the build costs of mines are higher.
Furthermore, the Atlanteans are very special (again, both positively and negatively) in the case of food. On the one hand, they don't eat raw meat or raw fish, prefer their own kind of bread made out of corn and blackroot and don't drink alcohol; on the other hand, they are so individualistic that no one of them would ever try to create the ultimate universal Atlantean meal. That's one reason why there are no taverns and why the miners are directly supplied with bread, smoked fish, and meat. (2 smoked fish/meat + 2 bread= 3 coal or 3 iron or 2 gold or 1 diamond or 2 mountain crystal).
See also GameHelpAtlanteans
Storyboard of campaigns and tutorials
see AtlanteanStory (still in progress) - WARNING: SPOILER!!!
You can find an illustration of the economy network (buildings, wares, workers) here:
There is a full list of Atlantean buildings that explains the basics of each.
Similarly, the Atlantean wares have their own overview.
When you click on a building or ware in either listing, you see further information about it. It is an extract of the economy network PDF linked above.
A worker is created in a warehouse, when there is a request (building without certain worker) and the tool. For example, to create an Atlantean soldier, there must be a light trident and a tabard in a warehouse and a request for a soldier.
To learn more about soldier levels and fighting see SoldierLevels.