Mini-session Turned Into Weekly

Hi Coaches- I am in Coach certification now and do not have my program created yet. I have a client who I offered a mini-session for practice, and she asked for a 45 minute session. After that session she asked for a 3rd and now she wants to know how much she can pay me for a weekly coaching package. I said I am creating my program now and I will continue to coach her as part of my practicum until it is set up. My thought is I can exchange value of coaching for money if I provide value ahead of time -which I have done -but knowing how much my coaching sessions are worth is tripping my up. How do I determine the amount of money to accept from clients?