I'm suffering from severe writer's block and get stuck in the middle of my books every time I write. Then I never finish.
When it comes to writing a book, there's some groundwork that needs to be done beforehand. There are even a few things you need to know before you begin to outline. Every good story is comprised of...
1.) A protagonist
2.) main goal/conflict of the book
3.) multiple tries and fails to accomplish said main goal and overcome main conflict
4.) satisfying resolution
There are obviously more moving parts to this outline, but that would take a really long time to get into, and I'd rather have you go watch the video tutorial I did on how to outline a novel since it's free, it isn't too long, and it will break up the process of outlining a novel into actionable steps that make sense and are easy to understand.
There are 7 steps I think are usseful when creating an outline:
1. Craft your premise
2. Roughly sketch your scene ideas
3. Interview your characters
4. Explore your settings
5. Write your complete outline
6. Condense your outline
7. Put your outline into action
Hope that helps!