There is a drop down menu called Match Type in the top left corner of the Matches screen set to Scenarios. In Scenarios, the civilzation along with most other settings can't be changed, so switch it to Random. Random, allows a lot of settings to be changed, so it should be more to your liking. The menu isn't perfect, F10 also opens it. Technology has just been implement, only citizen-soldiers can build advanced structures like barracks, which require the Town Phase. Players start in the Village Phase. Citizen-soldiers can be trained at a civ center (town hall), because advanced structures, like barracks, wouldn't be available otherwise. 0 A.D. isn't like most RTS games, such as Age of Empires, which inspired 0 A.D., where there is only one type of worker. Only the Persians have a stable, all others use the barracks for both infantry and cavalry. The cavalry at the civ center are also hunters. Waypoint markers would be nice. There are two types of workers, female citizens and citizen-soldiers (civ center/barracks infantry). Female citizens are better at farming and can only build civilian structures, while citizen-soldiers are better at quarrying and mining, and can build any type of structure, but get worse at civilian duties as they rank up.