I dont know if there are right or wrong questions to ask - its about how it "feels". You really need to feel a connection to your therapist. You need to feel safe and non-judged and feel as if you can say anything that might be on your mind. If you feel standoff-ish or nervous or uncomfortable around him - then its not the right therapist. It truly is a relationship and like any other type of relationship - some click and some dont.