pre to nano ( space ) - pocket going stone then copper 

now that youve gone stone, make more army and cits, if you still have a large army focus more on making cits to
gather as much wood as you can and to populate farms and town centers quickly once you get copper

you will be attacking with larger armies since you are in pocket, the better you protect them, the less army you
will have to make at your base and you can produce more cits with your food

as soon as you have the metals to advance to copper focus on getting the food and then advance