Use story prompts to tackle your writing weakness so that you can make them stronger, and to sharpen your strengths. Picking variations of the same kind of prompts to practice can help you do so. You can also use the same prompt over and over, between months or weeks to track your progress.
Story Archetypes allow readers to recognize their world or elements of their life in a story. They see themselves, what they could be, what they've been through, what they aspire to, how they want to live, what they want to do
Starting a book can mean starting off with planning or research. It can also mean starting with describing a setting or how a character feels. It is completely up to you and I. But it definitely starts with writing.