You can get c-section belts that come with a cushion, heat pad and hard plastic bit and I found it quite helpful especially the plastic bit to protect against knocks and I guess it would protect against baby's feet kicking you as well.
My Mum went and got me some Playtex maxi pants, they are huuuge but they were fab as they were nice and supportive and a very long way above the wound.
When Findlay was in hospital they had special cushions that were sort of half moon shaped that fitted round your middle for you to sit baby on to cuddle them/give them their bottle which were good.
Donna's kitchen towel suggestion is a very good point, I used a sterile pad in the hospital to pat it with after my OH started to dry it with a towel (I couldn't bend down properly to do it myself) at which point I nearly hit him
Most importantly make sure you are well rested before you go in as I'm sure you'll recover much quicker if you are full of beans.