How to select a physical therapist?

I want a physical therapist to work with me. I want / need to rebuild muscle, but am not healthy enough for any of the gym classes I can make. An 'elderly person' gym class would be lovely (even though I am 34), but they all happen while I am at work or are not well located for me. My goal would be to get enough stamina and strength to join a normal gym class of some sort going forward, and to get a better feel for what I can and cannot handle these days.

Any advice or questions that I should ask a potential physical therapist?

Edited to add: I had a bad experience w/ a previous PT who ignored me and made me too sick to work several times before I told him I might need to quit due to missing too much work. So I'm kind of on edge over this.