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I should structure the guide step by step: first, understanding the elements, creating the character, setting the atmosphere, writing tips for horror, marketing strategies for a themed event, and maybe ethical considerations for M-rated content. Each section needs to be detailed enough to be helpful but not overwhelming. Maybe include examples or checklists. Also, check if there's an actual event or group called OnlyTarts that I should reference, but if not, proceed with the assumption it's a fictional or user-created concept. Ensure the guide is creative and practical, giving the user tools they can apply directly. Avoid jargon and keep the tone encouraging for aspiring writers or event planners.