The classic approach to structure divides story into three acts, which we can further divide into distinct categories:
1. First Act - In which characters, settings and stakes are introduced to the reader. (e.g., in Star Wars: A New Hope, viewers meet the droids, Darth Vader, Princess Leia, Luke, and Obi-Wan, and learn what is at stake for the characters on a personal level and the galaxy as a whole.)
I'm a pantser. But... A basic structure for your novel keeps even the most dedicated pantser from writing himself into a corner.
You can't get more basic than the structure above. It will give you a way to get a handle on your book. This will build your confidence.