If you're interested in reading some sources that may help.

Therapists Spill: 10 Tips for Making the Most of Therapy

21 Tips for Clients in Psychotherapy | Psychology Today Canada

7 Tips to Make the Most of Your Therapy Sessions - Cognitive Psychiatry of Chapel Hill

Blog Therapy, Therapy, Therapy Blog, Blogging Therapy, Therapy,..

Otherwise, If I were in your shoes, as someone who has never been in Therapy but considered, I would just ask them what you are asking in this thread.