Shiela Kitsinger, Michael Odent, Maggie Howell, Grantly Dick-Read, Ina May Gaskin are all good for the physiology of birth as well as strategies on how to keep calm. They are all pro-natural birth but if you're planning on using loads of drugs I would still recommend a read because the information can be very helpful regardless.
The drugs will bring up loads of information on google, but also MN is a very good resource. I think the NCT and many baby/pregnancy sites also give some basic information.
Some of the other things have been well discussed on MN too so you could look through the archives.
Homebirth.co.uk is a really good site on what a typical undisturbed birth should be like but also includes information on drugs and the pros and cons of hospital policies plus strategies for dealing with them if you need to.
I think also that if you can, try to think outside of the 'options'. Sometimes the NHS present things as one of the other when actually there is a third way. For example 'vit k orally or by injection?' - well what about none?
Or cord cut straightwaway or after pulsating? - well what about after placenta delivered?
For a c/section, even emergency, you might want to put in your plan that any lines into you are all fixed somewhere that enables you to have one arm completely free in order to be able to touch and hold your newborn immediately.
Assisted deliveries are used for a variety of reasons. Sometimes it is just the judgement of a midwive that you are too tired to keep going, and they may be right, but you may wish to have it in your plan that should the second stage be prolonged you'd like to exhaust a variety of optimal delivering positions before forceps are considered etc.
There is LOT to learn - lol. Thankfully we all have time! 