When I started therapy (a little less than a year ago) I was very surprised by how my T helped me in ways I never expected. I was expecting her to just tell me how to fix everything in my life (very naive, I know, lol) but she taught me instead how to cope and how to identify my own self-damaging behaviors and how to deal with them or prevent them.
Anyway, my advice for you is to just be open and don't go in with too many expectations. Keep in mind that your therapist will know next to nothing about you, the only things she can know about you is what you tell her, and the more you tell, the more she can help you. Its scary (at least for me) to be so open but it is beneficial in the long run!
Best of luck, keep us updated! Also if you find yourself wanting to talk about therapy in great depth beyond BP I have found the psychotherapy forum super helpful, I hang out there a lot too