Let me preface this by saying that my experience with bread is limited to being a serious home baker and training in culinary school. I do not have any experience working in a bread shop. Lets break this down for you. That depends... does the recipe call for a stiff or liquid culture? I recommend that you get your hands on Peter Reinhart's Bread Bakers Apprentice or Jeffery Hammelman's Bread. Here is Peter Reinhart's instructions for making a starter. http://books.google.com/books?id=yHGBOXSNo...nhart#PPA227,M1 Partially correct. Oven spring happens when yeast reproduce wildly just before meet their maker. This creates pockets of CO2 that expand while baking. As the bread bakes, the moisture turns to steam and gives you your oven spring. You can improve the crust by steaming the oven and baking on a stone. Until the date on the package... First, you do not make starters with fresh yeast. The beasties you need are actively living in your kitchen, you just don't know it! The starter is only as good as the beasties that CURRENTLY live in it. You can find people who are willing to sell you starters from San Francisco and many exotic locations. In a very short amount of time, the beasties from those exotic locals will be displaced by local beasties and change its flavor to anything you find locally. Regular culling and feeding. You will occasionally feed the starter by throwing out most of the starter and feeding it with fresh water and flour. Best of luck Dan