Choosing a Tennis Instructor

What kind of personal and professional tennis experience do you have?
Just because you play well does not mean you can teach. It may be difficult for someone who does something really well to explain what comes so naturally to her. A good teacher can break a skill down into its components and communicate effectively with the student (and still play a mean game!).
Are you a certified tennis instructor?
Some certifying organizations are : USTA (United States Professional Tennis Association, PTR (Professional Tennis Registry) and ITF (International Tennis Federation)
How will you improve my game?
How do you price your services and what do they include?
What is your policy on cancellations and make up sessions?