I had a C-section with my 3rd, no internal exam.
I don't think it's part of the process.
if there's any problems or doubts about baby's position you'd have an ultrasound if needed.
you need to not eat anything after midnight, not even water after 6 am or whatever you were advised.
you go in, get your bed, gown up and surgeon and/or anaesthesiologist (sp?) will come talk to you and get you to sign papers. you can ask any questions then.
it is nerve wrecking, but try and keep it together.
I was told I can take my favourite CD and we listened to it in the op theatre - take yours and ask if they can do the same for you, shouldn't be a problem! it will keep you focused/happy/calm to have something familiar & well loved to listen to.
when you are in you will get a spinal, you must do as you are told for an easy siting of the meds. your legs will go numb, can't lift them, your arms and chest might feel heavy too. if you find your breathing is troublesome you will get an oxygen mask to help you. you might feel a bit panicked or claustrophobic from not being able to move, but that's normal, you can do it and you will be ok!
any problems at all just tell them, they know what they are doing and will take great care of you and your baby.
when she or he is about to be born they will tell you that you'll feel a tug (not painful), then they will lower the screen and lift your baby up (like in Lion King 
) so you can see him/her.
they will them be busy checking and cleaning baby up, it's very quick but they must focus so if you are ignored for a minute or two again don't panic, they are just making sure baby is ok!
you will see your baby close up and able to kiss baby asap - holding too if you are up for it - remember you are still being stitched up and might feel dizzy or weak or whatever. it's all ok.
first night no walking or getting out of bed, but you will be encouraged the next day. hope this answers your questions.
good luck for tomorrow, I'll be thinking of you.
drop a line if you can!
big hugs