Avoid writing flaws, especially with the subject and verb. How often does the red pen jump into the mental fingers. The Internet has many short online tutorials to remind one how to do this.
How to write a scientific manuscript for publication. Count or calculate the number of steps involved in presenting your process flow, the number of decision steps and the worst-case number of processes that can result from an individual decision step. While you need to know what kinds of books sell, you also have to know yourself well enough to know what kind of book you're capable of writing. Are there long paragraphs more than a page and sentences more than three lines.