What do I need to buy?

For the first few lessons you don’t need to buy anything. There is the remote possibility that you will decide that flying is not for you.  The instructor should be able to provide you with a headset and training material to use during that time.  When you decide to commit to your flight training, you’ll have a much better idea of the equipment you will need.  You will know what type of training materials the instructor uses, the type of headset you’ll want, i.e. one with active or passive noise reduction, and other pilot supplies