What was a performance like during the ancient Greek times--what were the stories about, what did they look like, what were the actors like?

I don't know much about this but:

Greek plays usually consisted of men, playing as both men and women. The plays usually were about heroes or epics, since it was one of the more entertaining parts of ancient Greece. The actors in Greek theatre were semi-professionals. They were paid for their performances, but acting was not their full time occupation. There were no actresses on the Greek stage. All the female roles were played by men.

Sorry if it isn't correct, this is just what I remember from my awkward middle school phase where I would only read percy jackson bookshope this helps! :D