That's incredible idea! Its implementation will help lot of creative persons who might haven't had enough practice and make some mistakes. Ordinary classes or tutoring aren't as productive as giving a student freedom to write with a friendly advisor aside. Also you may invite some published writers, columninsts, publishers, editors or any other professionals from this niche. Maybe even start from professional copywriters like in https://copycrafter.net/. These guys publish great advice and always produce high quality paper, so they definetely will have enough knowledge and experience to share.