A couple of other suggestions from someone who has had a long journey on the SS Mental Health:

- Gender. Consider what gender you might be more comfortable with. Many of my male friends prefered female therapists, I personally felt like I was talking to a maternal figure and found I was better off with a guy. No shame in either choice.

- Trial period/multiple options. When I first moved to my current city I made appointments with multiple therapists, even seeing two simultaneously for a few weeks. You want to be comfortable with them and it can be very hard to tell from one session. This is obviously very insurance dependant though.