From Carly Watters, Literary Agent.
My added tip: Have conversations in your head as you imagine past situations. I do it all the time, and sometimes respond aloud by accident, confusing my husband who has no idea what I’m doing (cause when I day dream, I day dream HARD). No, I’m not crazy. I’m a writer. We have vivid imaginations, right? . . . Right? Also, twitter conversations teach you how to be expressive and keep it short – like a real, live convo. It’s good practise ground.