You already know what job you would like to exercise? If you had lived at the end of prehistory, you had no choice, you was a farmer or craftsman.
The City State is a State that consisted of a single town with surrounding areas. The City State had its own Board, judiciary, tax collection and defense. The first farming communities grew around 600 v. CHR. into city States.
Do you know everything of the epoch in which the ancient Greeks and Romans lived? This time is called antiquity. It lasted from 3000 BC to 500 ad.
Did you know that democracy is not at all modern is? The ancient Greeks 2500 years ago gave the people the chance to talk to about important decisions.