Tips on starting coaching

I’m going to join the September 2020 coach certification training class, and I’m exploring starting some free coaching for friends. I had a call with one friend the other day and have another one tonight. She is looking at weight loss but also other things in her life. I found myself on the first call trying to mostly explain the model and how brains work and then we did some coaching on one thing (did an UM and IM). I think for this one I will try to simply let her talk and then I will say back things that I see/hear that may not be working for her. Was wondering if there are other suggestions when you first begin with someone. And, if I talk with more people, is it too much to try to explain brains and the model for the first meeting each time? I tend to get into professor mode (lol). Thank you!