You may wish to ask how the therapist handles emergencies and vacations. Most of us arrange for a colleague to take emergency calls when we are on vacation. The other type of accessibility is physical. People who have difficulty walking or who use a wheelchair are concerned with whether the therapist's office is accessible to them. If you have a hearing impairment, you will probably want to know if the therapist has the skills to communicate with you and the equipment needed to take your calls.
Some people feel uncomfortable asking therapists what they charge.
Also, some therapists have a sliding scale for fees, which means the cost of therapy depends to some extent on your ability to pay. Some therapists ask that you pay in full each time. These therapists will give you a receipt to send your insurance company. Other therapists will bill insurance directly and ask you to pay only the part of the fee that insurance does not cover. It will help if you find out what kind of mental health coverage you have as part of your health insurance.