Mystery Novel

I am trying to write a mystery novel. I've written horror novels and historicals (the latter for kids), but I wanted to try my hand at a mystery because I enjoy reading them. Not one of the heavier ones, though. I believe the type I'm writing is called a 'cozy,' mostly because the really gory stuff happens 'off camera.' I had no idea how hard it was going to be. I have a little over 200 pages written. I'm going back over it and finding too many loose ends I have to fix. I know aobut 99.9% what the ending is, but I have to make everything else mesh so that it works. I have a reading comprehension problem. It's hard for me to keep track of things with lists, charts and diagrams. So I've started typing out a chapter-by-chapter synopsis of what I have so far. This is helping me to see some of the points I've missed, or gotten wrong. I hope to get back to the book very, very soon. Right now, it's all a jumble to me. But I need to get the damned thing written and published. I need the money.