In a cover feature last spring, New York Magazine invited 30 notable New Yorkers to share their memories (mostly fond, some harrowing) of arriving to town. Next week, Ecco/HarperCollins will publish “My First New York,” a greatly expanded collection. Here, from the book, are a few new entries—the early adventures of three writers — plus an actress, an editor, and a famous former call girl — in the big city.