How to Put a Master Mind Group Together

I am doing Market research this week on how to put a mastermind group together. For me I always try to think things through step by step. As Steven Covey says, "begin with the end in mind." So my first thought was a question. What is it that people most want from a mastermind group? While brainstorming this personally, here are some ideas that came to my mind:
forming strategic alliances
interacting with like-minded people
mentoring
problem-solving
working together towards a specific goal or goal
sharing collective ideas or strategies from a class or course
discuss what is working and what is not
Once you decide the general purpose of the mastermind group, next ist is time to market or promote it. Having a personal understanding of your target marget, who they are and what their specific needs and wants are can be attained via a short survey.
Once you have the survey data this will enable you to develop your marketing message. My next step is to further learn how to use the WordPress plug-in for Survey Gizmo. Implement it here for testing and teaching and next actually use it to find out more from potential clients.
I would love to hear more from my readers, as to how to put a master mind group together and gather your suggesstions and advice about what worked for you and what didn't. What marketing channels did you use to promote your message?