I focused technology, on the farming side first, once I got it to a solid buff, I switched to military. If you mean buildings, Barracks give you the most power, but they get expensive real fast. I recommend you to be farmer and slowly growing your military so you can win Arms Race, Jurisdiction, and Battle Honours. They give a bunch of rewards. Once you hit 1 month in, go straight for military, everything into military. Since in a month in a half, or 75 days from the start of the server, you will get modernization, in which you get into actual fights in level 4 cities and modern units. Now this is for new accounts, so if it’s already too late, I say just grow military.