How to handle the eco in feudal

So i simply struggle getting into castle age in time. I spam farms after my inital opening, but always come up short. What should ido excatly? How many villagers should be on wood and food?
And what should i do, if my opponent does a counterattack/counterrush?

Also, how much villagers should i go for? As far as i aware, i should go for half of the population limit, a.k.a 100, but my opponent sometimes go for 140+, and i already struggle with space with 100.