Once I've spend days of hours with the idea for a book, I then decide what's next. For me, that's the Plot. While there are many types of Plots, I must choose the one that's right for the book. For a fantasy story, I usuallt choose the Quest plot. This emns sending my characters out into the world in search of something. Sometimes a physical thing and sometings more of a growingup quest. These are fun to write.
The story I'm talking about today is pursuing Doctor West. This uses the chase plot. That's often the case of a romance, at least the romances I write and enjoy reading. In this story, Zelda has loved Doctor West since they were children and next door neighbors. Her attempts always seem to be futile. How can she win. The opening scene shown him returning home as a surgeon and joining and group of doctors. He learns Zelda is the nurse manager of the surgical unit. He wants to avoid her but tha doesn't seem possible. Zelda sees him andknows what she wants. The middle of the book is the chase and her many failures to succeed. Then comes the twsit as the middle comes to an end. Zelda decides she will never succeed and she decides to leave. Suddenly the reverse happens and he decides to chase Zelda.
So having decided on the plot, I begin the process of writing which ever book I've decided to write.