As I started to play I couldn't get very far because I ran out of food.This is because when I built farms they were quickly over run by locusts and this was on easy.
Best thing to do is use your will power to grow the crops by producing rain. This will increase your food resources for a time, but it will eventually decrease. Best thing you can do is play the market with what resources you have, what you have in abundance sell and what you don't buy.