Men who were of Athenian birth and free-born. if you weren't born there you had no right as a citizen
Nobody chooses the rulers. If its through a system of heredity, when the rulers die their children take over.
Introductory Paragraph. See, first, Writing Introductory Paragraphs for different ways of getting your reader involved in your essay. The introductory paragraph should also include the thesis statement, a kind of mini-outline for the paper: it tells the reader what the essay is about.