On my cane, I let it dry at least 2 months before working it up, but have them bundled as tight and straight in bundles of 12 or more while they dry. As for the size, when I cut my cane, I always use a 3/8 open end wrench and let that be the biggest end. When I make my arrows, I try and get the nock ends around 9/32 so I can keep the same finger pressure and split on the arrows all the time, and to start with, once I cut the 9/32 end for the nock, I spine my cane and find the stiffest side. That will go towards the strike plate. And a general guide line to start with, is use a spine that is about 10 lbs heavier than your bow weight if you are shooting 28" arrows and 125 grain points. Any shorter or longer or lighter or heavier points will be calculated just like you would on wood or other arrow shafts.