The Assembly
The Assembly took place 40 times a year where the men would vote on issues. To attend the Assembly you would have to be a free male who's parents were born in Athens and after completing a military service (age 20). There would have to be at least 6000 men present to pass a vote through. They would meet in the Pynx.
The Council of 500
The Council of 500 where male citizens who were 30 years old or older who would make up ideas for laws and discuss them at the Assembly. You could only serve in the council 2 times. The men were randomly selected for the council.
The Court
The jury's that they had in Ancient Athens where at least 501 men to 1500. You had to be 30 years and a male citizen to be on the jury. The jury resolved disputes and decided on punishments. You could go on trial or just get fined depending on the case you would have been involved in.