I was looking at a student's novel the other day, which starts with some long descriptive passages including a dream...it was all good background, but I suggested the story really got underway with Chapter 3, when we see the two main characters in action, and then being presented with a major problem for them both at the end of that chapter.
He defended his choice, and then I defended my suggestion. What had happened at the start of our session, I asked. Did he come to my office, and I told him all about my previous history, starting with where I was born and how many brothers and sisters I have? Or did he come in, sit down and then we got on with discussing his work, with the sketchiest of introductory pleasantries?
Stories need to start with the characters coming in and getting on with it, whatever it may be. There's no need to know anything about their background, and if a particular bit of information becomes necessary, then you just put it in as and when it's needed.
Come in, sit down and get on with it. It's that simple.