You can bare shaft, but I don't bother. If the spine is way off, the arrow will come off the bow almost sideways and often break in the target. Cut a few to length (28 inches to allow for the one-inch point taper and one-inch shaft overhang beyond the back of the bow), fletch them up and shoot them. Stain/finish doesn't affect the spine. Try both weight tips. One is likely to shoot a little better than the other, but the difference will be so little that you're not likely to detect it. I concur with Prairie Drifter re spine. As others have already pointed out, Hillenbrands Sitka spruce and Surewood Doug fir are excellent shafts. Doug fir is heavier and tougher than spruce. You might want the extra weight of fir in a relatively short arrow for hunting.