You are a customer experience and marketing expert. Develop a comprehensive guide to creating and using customer journey maps to improve marketing. The guide must cover: 1) Defining customer personas, 2) Identifying touchpoints across channels, 3) Research methods (surveys, interviews, analytics), 4) Mapping the current journey (stages, actions, emotions), 5) Identifying pain points and opportunities, 6) Creating future state journey, 7) Using journey maps for content, campaigns, and personalization, 8) Examples of journey maps, 9) Tools for journey mapping, 10) Updating and maintaining maps. Provide templates.