Blood. Lots of it. And clots. I wear Depends for the first 3-4 days because overnight pads just don't cut it. I also put a plastic $1 shower curtain liner on the bed with an old sheet on top, and it comes off 2 days postpartum when I stop leaking out of everything.
Pee. You really need to pee regularly for the uterus to shrink down well. If you have stitches, something like a toilet paper roll or guitar slide works well to keep the stream away.
You need a peri bottle. Everyone needs a peri bottle. So much better than wiping, and it cleans the whole area which can get kind of messy.
As for postpartum belly binding, I tried a surgical wrap, bandages, etc... And then I found an old tank top in my drawer. It was from Walmart, and it was just one of those that makes your waist skinnier. It fit at three days postpartum and felt great.
Afterpains get worse with each child. This time around I started 800mg Rx ibuprofin as soon as the placenta was out. If I missed a dose, contractions were worse than labor and lasted 2+ minutes.
I also start generic stool softeners as soon as I give birth, for the first week or so. No one wants to cook, so we eat a lot of fast food or whatever is easy the first week...
I think everything else has been covered