All you need is you and the baby.
I have had two midwife-assisted births and two unassisted births, and I have never taken herbs or supplements of any kind during labor. It can be a nice extra for some people in some cases, but certainly not necessary. Susun Weed's book Wise Woman Herbal for the Childbearing Year is pretty good for dosages and contraindications. Your midwife may have a copy, or maybe you can find one at the library.
It will help to squat for the placenta -- don't pull on the cord, just nurse (or do nipple stimulation if the baby doesn't want to) and wait for the urge to push. If you are concerned about bleeding, cut off a bit of the placenta and swallow it.
If you plan to cut the cord, wait until the placenta is out. You can cut anytime after the baby's breathing is well established, with a scissors sterilized in boiling water for ten minutes, and tie off with a white shoelace, sterilized also.
Fetoscope and doppler -- it's questionable how helpful they are in labor to begin with, and if you have no practice finding hearttones and knowing what they mean at various stage in labor it will just stress you out, which of course you want to avoid in labor!
Let us know if you have any more questions, and let us know how it goes!