RE: Dowels for arrows?
If you want to try it get ramin (sp?) shafts. They have no real grain pattern like hardwood dowels do. They make pretty decent arrows. As far as sanding and sealing... Just chuck it into a drill and sand it like that. Then seal it.
I prefer POC though. Shouldn't be to much more for those. But like I said if your just wanting to try it its not a bad way to go. Especialy for kids arrows.