Thanks for all the advice.  I'm getting it done, now.  Here is what I learned.  I have no idea how to age them, but the wood of each seems to have similar weight and hardness, so I'm going with it.  They are NOT as tough as I expected, though, tougher than willow, or rose, but not as tough as plum shoots.
  Anyway, I procured a rock from the landscaping at work, with a medium rough surface and thus some real ability to apply friction. I used another rock to grind a small groove in the edge.  This works better than a regular hook.
 What I learned is that, unlike other materials, I can't just let them flex a bit against the hook as I work them.  I really have to flex them pretty far, like crank on em good, and then apply the metal hook or the rock.  I have to bend them more during the hooking than anything I have tried yet.  actually, the plum take about the same, but I had always done plum with heat.  Lot's of bend and hard, high frinction rubbing do the trick.
Next time, I willnot cut them to 30", and will leave them longer, so I have more thickness to form nocks at the skinny end.   They are spining out ok, and I can scrape the front end down, but leaving a few inches will allow me to do that cranking on the front end, and allow me to mess with spine more by massing with length.
  Thanks guys.