Generate a full detail guide on how to create and maintain an 'Idea Journal' or 'Creative Notebook.' The guide should be inspiring and practical. It must include detailed sections on: 1. Why capturing fleeting ideas is crucial for any creative person. 2. A comparison of physical notebooks vs. digital apps for idea capture. 3. A guide to structuring your journal with different sections (e.g., Observations, Snippets of Dialogue, Sketches). 4. A list of 15 prompts to use when your journal feels empty. Please include a supportive disclaimer.