Here is a nice video on an European Beech tree by Bonsai Eejit. In the United States the most common Beech tree to use for Bonsai are European beech trees usually found at a nursery. American Beech trees are also good for Bonsai and can be found on the east coast. In the west you probably are going to have to settle for a nursery tree. The video has been posted on the Beech Bonsai page under Deciduous trees and Tree Information page.