Congratulations on diving into writing! I'm so proud of you!
My suggestion would be to read a few books, maybe The First 50 Pages by Jeff Gerke. As a new writer, I think it will be beneficial to just understand the story structure of the first 50 pages of a novel as this is the foundation for the rest of your book.
I also recommend The Magic Words by Cheryl B. Klein. This book does say for Middle Grade and YA novels, however, I write Adult and still found so many useful tools within these pages. For example, I still use the concept of Decision and Consequence (she calls it something different) to outline my novels.
E.g.: MC makes a decision = MC experiences consequence. MC makes another decision. MC experiences another consequence.
I also use concepts from her Plot Checklist which will help you build three-dimensional, deep characters.
I hope this helps! Z