Well, starting a mob talker female yaebi fanfiction can be exciting. You can start with a hook, something that grabs the reader's attention right away. It could be an action scene involving the female Yaebi or a mysterious statement. Then, you need to establish the world she lives in. Describe the mobs, the environment, and how things work. As you write, let your creativity flow and don't be afraid to deviate from the original concept a bit if it makes the story better. Also, read other fanfictions for inspiration but make sure to put your own unique spin on your story.
First, you should research about the mob talker universe and the Yaebi character. Know their characteristics, abilities, and the general setting. Then, come up with a basic plot, like a simple goal for your female Yaebi character. For example, she might want to solve a mystery in the mob world.
Begin by creating an outline. Decide on the main events that will happen in your fanfiction. You could start with introducing your female Yaebi character, her personality, and her current situation. Then, think about the conflicts she will face. It could be internal conflicts like self - doubt or external ones like facing a powerful enemy. After that, write a rough draft, focusing on getting the story down first rather than perfect grammar.