Here is a great video by Ryan Neal on how to make a Bonsai tree out of nursery stock. Ryan goes through the process of selecting the tree at the nursery and then going through the steps of analyzing the tree and finally styling the tree. He also gives pointers on to develop the tree as it grows. This is a typical style and quality educational service that Ryan offers depending on the level of service you sign up for. The video is listed under Nursery Material page under Bonsai Basics.