Wood for Weapons
I second the above referral to the article on woods for weapons. I found it very interesting and informative reading. All my weapons are Japanese white oak.
What I've been taught about suburi (10, 100 or 1000, whatever) is that first you teach basic correct form, then practice, practice, practice, make necessary corrections to form, practice, practice, practice, and so on and so on. The combination of instruction/ correction with practice leads to more correct striking (along with everything else in MA...well, and life also).