fees for first coaching clients

I’ve completed my coaching training and I’ve coached about 6 people at fees ranging from $50 to $165 with most around $80 per session. I would like to coach about 5-6 people at a time while I write my book next year. I’m not coaching anyone right now, so I’m starting from scratch. I’m not sure where to place my fees or how to make the decision. How would you suggest setting fees when you are just starting out? Thanks!