I had this idea for a story I wrote about earlier. It is kind of like a comic book universe where it focuses on a few heroes at a time at a certain city or borough. I wanted the first 9 to have little if no connection between one another, and in the 10th to make a crossover of 3 books and repeat this. after the first crossover characters of other stories will appear. Basically, it's like comics but one book at a time. What is the best way to do it?