What I can suggest is the following:
Set yourself a usual round of 'eyeing' your screen, meaning you look at minimap, (time etc), then top right for minerals and gas and FOOD.
Early game you should probably build food every time you reach the 4food-till-block stage, and then later you can build additional supply 'entities'.
As a zerg, I build my OL at 15, 22, and then usually doubles at 34ish, 52 etc.
Also, try to spend your money on ANYTHING, but make sure it is not useless, i.e. hydras vs collosus and lings instead of drones. In a few leagues you will know when to make army, and when to make drones
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