Here are some links to previous CBT threads that you may find helpful:
The follolwing link may help you understand what credentials a CBT therapist should have.
Of course credentials does not mean a certain person is good at what they do. I would consult my Dr. as well as talk to anyone you know that may have gone through CBT with a therapist for their opinion and then make an informed decision re what you would like to see in the therapist you choose.
I wish you the very best of luck.