All depends if you play vs people or computer.
In general walls are a waste of stone. Use the stone you gather to make castle(s) as soon as you hit castle age.
For Chinese , you'll want to have more workers on wood. Building chokunus and halberds is the way to go. deploy threbs let you troops protect them. Have some cavalry on standby if they assault with siege.
AOE is all about resources . You should have 60+ villagers atleast(I go for 80)
The longer they need to run to longer it takes to gather resources, dont forget to build (and rebuild) whatever is needed close to the resources. A villager shouldnt run across 2 fields to get to a mill.
Only tech what you are planning to use
VS AI , built some watch towers , they will attack them, saves you some time .