First you need to find a therapist you feel you can work with and then the two of you will decide together how often you should see him/her. It is possible your psychiatrist can give you some leads as to therapists he works with.

Often psychiatrists and therapists work together, as a therapist can be helpful discussing your meds and how they appear to be working for you with your psychiatrist. The two professionals can often note things together that we don't know what to look for or sooner than we might or than we might be able to put in words.

But, whether your therapist and psychiatrist work together to help you or individually under your direction only, is totally up to you.