Generate a full detail guide on starting a subscription box business. The guide must be a comprehensive business plan. It should include detailed sections on: 1. Choosing Your Niche and Model (Curation vs. Replenishment). 2. A guide to product sourcing and building supplier relationships. 3. The Logistics of Kitting and Shipping: A breakdown of the process. 4. A financial model for pricing your box and managing recurring revenue. 5. Strategies for marketing and reducing customer churn. Please include a disclaimer.