Step one: create the characters. Draw the format of what you want them to look like. Then give them a name and personality. Figure out what should happen to them and when do they enter the story? One time I made characters based off a pair of friends and made them sisters but turned them into worst enemies. It was quite interesting. It is called the rival sister diaries: Marlene and Sandy Silva. It is on my blog called Novi Cats. Check it out @ novicats.blogspot.com....k? It may give you some writing ideas.