If you are a hypnotherapist then creating a generic recording may be a straightforward task.
Choose an area of your expertise, such as relaxation, removing exam stress, weight loss etc. and create your script. Record using a good quality microphone and convert it to mp3. Upload it to a site of your choosing (I have used dropbox but obviously that could be open to misuse if someone else gets hold of the link).
Are there areas where you appear to have repeat business? Or do you have a burning interest and desire to help in a specific area?
Consider creating an online course and set up a facebook group to support your interests and where you feel you can best serve.
Other sites could be Udemy as an online learning platform. Free to set up and they take a percentage of your course sale. A quick way to set up and get running!