Meet during the day for the first time. Try to find people who share your reason for starting a group - it'll be smoother. These will probably change as your group grows and gains experience, but they should be considered early on. By their very nature, the media has special requirements that you must be prepared to deal with. If they accompany you on an investigation, be prepared to answer a lot of questions and accommodate extra equipment.
Media personalities are human, and each has their own personal feelings and beliefs.
Be prepared to deal with skepticism that borders on antagonism. They are trained to ask probing questions - it's their job. Don't take it personal. Be on the lookout for any attempt to sensationalize what you do. They are looking for ratings, we are looking for leads.