Although I don't have the privilege of being a L&D nurse (yet!) I do highly recommend your NRP certification and also the book Labor and Delivery Nursing: A guide to evidence-based practice by Murry and Huelsmann.
Your OB meds are pretty easy to learn. The common ones are Cervidil and Cytotec to start labor. Epidurals are handled by the CRNAs. Pitocin is usually given. Post birth pain meds are often Tylenol with codeine and ibuprofen. Also Norco. It may or may not help to know that Cytotec has been linked to uterine rupture, amniotic fluid embolisms, and hemmorhaging needing a hysterectomy. I don't think that patients are informed of that!