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Just got this game a couple days ago, been playing online with a friend, and we can't figure out how to advance from an early age to a later age, and get buildings that weren't available at the start. How do you do this? Thanks!
If you're referring to the campaign missions, they have set units and buildings that you need to use.
If you want everything available, try sieges or the economic free play. It's not so much 'tech advancing' as it is a progression in the order you build them. For example, archers... you first need wood, then a fletcher, then an armoury for the weapons, and finally the barracks for recruitment. Each one is useless without the one before it.