When I was an OB instructor, I usually had an orientation day with my students to go over a lot of information before I had to set them free on the unit. I really recommend this. Taking even a couple of hours the first day to just go over basics in a small group setting where they feel they can ask all their "stupid questions" (their term, not mine) before starting patient care makes for more confident, more successful students. Some of the things that I felt students really benefited from going over in the clinical group setting:
- assessment items specific to the postpartum mom, i.e. fundal checks, normal vs. abnormal bleeding
- newborn physical exams - including how to swaddle

and change a diaper
- basic breastfeeding - how to position the baby, how to get the baby to open their mouth, how often is normal
- unit tour - let them see and touch the monitors so they know which is the toco and which is the doppler, I also had FSEs and IUPCs for them to look at and play with, we would also talk about how to read the labor board (G4P2, 1/75/-2, what does that mean)
For clinical conferences, we did lots of different things. I have a set of DVDs from AWHONN on nursing care in labor that we watched and discussed. I have the maternity skills CD, too. We toured the Mother's Milk Bank at one hospital I had students at. We usually spent a conference talking about VBAC. Guest speakers are good - lactation, or one hospital had a doula program, and the doulas talked about labor support. Looking at fetal monitoring strips was usually popular.
I have a couple handouts that I would give out, listing the most common meds used in OB and common OB abbreviations. Students were required to have worksheets done with answers to basic clinical scenarios so I had some idea they had been paying attention in class - since they can't "prep their patient" in advance like in med-surg.
Good luck - I miss it a little. They have so much energy and enthusiasm.