1. "The Great Gatsby" is set during 1922 in West and East Egg, which are two (fictional) towns on Long Island. As such, Fitzgerald depicts a lavish life during the decade of the Roaring 20s, shown by Gatsby's extravagant parties.
2. The narrator of the story is Nick Carraway, who moves into West Egg, just next door to Mr. Gatsby. Carraway is from the Midwest, attended Yale, and is a war veteran. He becomes friends with Gatsby, and initially arranges a meeting between Gatsby and Daisy.
3. Before marrying her husband (Tom), Daisy Buchanan had a relationship with Gatsby. She is also Carraway's second cousin. Daisy is described as a "flapper," which is a young woman specifically from the Roaring 20s, regarded as fashionable and not overly concerned with conventional behavior (aka, acting like a "lady.").