1.whatever type of wood (dowel or clothesrod) that it'll fit the contour well enough--to prevent or minimize splinters and exit damage, depending on thickness.
2.standard type bit, or 120 degree would work-I would advise against hole saws, it'll produce terrible holes. If possible, get solid carbide bits, at the minimum, a TiN would be ok, although you may use more than one..carbon dulls cutters very quickly.
3. 282 and 1k are common weaves found outside of aerospace now, as they are getting cheaper. 282 is strong, and has a larger but not very dense weave. 1k is much denser, but thinner, and usually used as a face ply as it looks much cleaner. You may even run across 584, which is a very thick weave, and does not cut as well. I am assuming that most of these are wet layups, and hopefully vacuum bagged--it'd be nice if they were pre-pregs.