Any type of end grain boards should do the trick.
Sorry, wootz is apparently a type of crucible steel, and apparently by the 20th century there were so few and sketchy records of its particular method
Hey, sorry for the late reply. I'm afraid there's no saya for the deba. It just has a little soft plastic edge guard.
Plenty of good choices from forum venders, including a 400/1200 combo stone from Dave Martell pretty cheap. I used to use Norton oil stones for this kind