Summer rain is imagery a type of figurative language. And what figurative language can do to a story is set the tone, and when it is imagery it can create the setting.
It is true that the expressionist described the world outside the character through the character's moods and impressions.
Answer:
what the theme, genre, topic will be
who are the characters
what is the exposition, rising action, climax, lowering action, and resolution
what kind of story will readers enjoy
finding transitions between chapters
what point of view to use (first, second, or third)
there are more but this is a lot :l