Howdy @Former-Member Hope you're doing ok.
I've had two psychiatrists. First session is always hard and draining. They are going to ask you a lot of questions about symptoms, yourself, personal life, history of symptoms (when they started, have they got worse etc), and family history. Just try to be open and honest as you possibly can but if you are uncomfortable answering tell them that.
Each doctor is different (more on this later). Some may appear to be a bit distant and some will be a lot warmer. My first was the former and my current is the latter. Both are ok, in the first session the psychiatrist will be working really hard trying to figure out how to help you. If they appear distant it just means they are working really hard. Over time you will develop a relationship but for this first meeting you should just focus on providing open and honest answers to their questions.
As far as what happens next sometimes they will give you a diagnosis (and a treatment plan) and sometimes they won't. If this is the case they just need some more time to figure out what is best for you. This is a good time. Although seeing a psychiatrist can be really stressful being patient is part of the game. With my current pschiatrist after the first appointment she just told me to track my mood and come back in a month. In that second appointment we made some decisions.
You will form a relationship with your psychiatrist so in this first session I ask them questions too to see if they are a good fit. Feel free to ask about their background, why they chose psychiatry etc. But I advise to stay away from personal topics after all this is still a professional relationship.
Why I like both of the psychiatrists I've seen is because they take charge. My current one in particular. She just takes charge in such a way you just innately know she has got this, it's all going to be ok. For me both psychiatrists have been such a positive force in my life. I hope its the same for you.
Feel free to ask any more questions and let us know how you go.