As far as I know Aeschylus, a Greek tragedian, does not appear in Sophocles' tragedy Antigone. He wrote his own tragedies, namely Agamemnon, Prometheus Bound, and Seven Against Thebes. He is related to the play Antigone, I suppose, because his play Seven Against Thebes provides the antecedent action to Antigone. It is a kind of prequel, as it details how Antigone's brothers Eteocles and Polyneices killed each other in the civil war of Thebes.
For the other questions, you'll have to research "Ancient Greek Theater," (see link below) as they are not found in the play itself. They are terms related to a part of the structure of the play and the stage. You are only allowed to ask one question per day, regardless.