Your book has MANY CHARACTERS and MANY THINGS happen in it. These are DETAILS. They are good for a writer and interesting for a reader (to imagine the story in your mind) --- but you don't have to tell me about EVERY character and EVERY thing in the book. Tell me about the IMPORTANT characters and the IMPORTANT things. Remember our story "The Killers":
Mrs. Bell = not an important character.
One of the killers always looks at himself in the mirror. = not important.
The killers want to kill Ole Anderson. = important.
You should decide what is important and what's not. It's up to you.