Oh, I am sorry for your loss. I had 2 erpc/d&c last year (molar pregnancy, hence two), and the whole thing was so much better than I'd expected. Not much you need to do to prepare - there can be some hanging around, so take a book/magazine, and you won't be able to eat beforehand, as it's GA.
You're under for just a short time, so I had no side-effects of the GA, but you will be very tired afterwards, so make sure you have someone to look after you for a day or so afterwards, and let yourself rest properly.
I was out about 3 hours after the procedure - they got me to have a sleep, then brought me lunch, and then called DH to come and get me. It's important that someone pick you up, as you will be a bit wibbly and sleepy.
There is some bleeding afterwards, but not much iirc.
Nothing I wish I'd known, except that it wasn't anything to get stressed over - I was positively chilled for the second one! Afterwards give yourself enough time to deal with the emotional impact of what's happened - that is harder.
Good luck.