Therapy is an exploration of yourself and therapists will draw out stuff for you to talk about. There are some decisions to be made and one is are you going to be totally and completely honest or are you going to keep stuff back for some reason?
I told my psychiatrist at the outset that I would keep nothing back and I would tell the truth no matter how painful, but that I also didn't know what to say and that I would need guidance. Funnily enough he thought that was a good idea as that was what he had been trained for

Anyhow it all comes out in the end and a good therapist knows when you are skirting around issues, if an issue or an area is very difficult to talk about , tell them, but let them know it is there. Many of us who have suffered sexual abuse can find that very hard to talk about, we have often regressed it. But it needs to be tackled at some time, no matter what hell it is reliving it.
The therapy sessions are to help you. And that works best if you want to be helped.
I know many of us have been in tears and wrecks during sessions. That is usually a good thing.
What questions to ask? Well besides the obvious like how long, how much, what is the process that is being followed, how are decisions going to be made about my outcomes. Then the questions are up to you.
Certainly in my early sessions I didn't really have questions, I was talking about myself, my life, my feelings and my problems. My therapist asked questions and I asked questions about the questions, both of us seeking clarification of what we meant.
For example; do you think you have a narcisstic personality and life style? If you don't know what narcissism means ask! Psychiatrists and therapists in general have their own language and meanings need to be clear. So ask.
Also do not be ashamed, you are going to talk about stuff that has created you and how you deal with it. If you are uncomfortable talking about your sexual habits say so, but be prepared to answer why. And in fact take it on board and think why?
Therapy sessions may last a half hour, but that is in the room. If you are sensible about helping yourself, therapy sessions last for life.
You think about what was said, analyse it and think about it, and change to suit what you find useful.
You can take therapy as a 'gate' keeper step. I hate that concept. I took therapy sessions as the 'get rid of the crap that has been destroying my life' step. When I knew how to deal with it I knew it was time to move on; by some strange coincidence my psychiatrist thought I was ready to move on at the same time that I did. Funny that.
The last piece of advice my sound really really stupid.
Enjoy it. Enjoy talking to someone to whom you can release your soul. Be proud of yourself for doing so. For you are a strong person to face yourself.
Hugs and Love
Cindy