One of the best set of prep and cooking instructions is from George Mateljan's In-Home Healthy Cooking School.  Short video clips give actual demonstrations on chef-quality kitchen tricks.

• Almonds, Blanching
• Bouquet Garni 
• Cake Decorating
• Cake Decorating II
• Cast Iron Cookware, Season it (eventually he does it)
• Cast Iron Cookware, Care for it
• Chicken, how to truss
• Chicken Stock
• Chicken Thigh, deboning
• Chiffonade
• Chiffonade II
• How to Dry Plums into Prunes
• Egg Whites, Whipping
• Egg Whites, Whipping II
• Fish Escalopes, how to cut them
• Fish, Filleting
• Fish, Filleting, II
• Ginger, how to prepare
• Ginger, how to candy chopped rhizomes
• Ginger, how to make crystalized
• Julienne vegetables
• Leeks, how to clean
• Omelet, how to make one
• Onion, how to cut
• Pasta, how to cook
• Pasta, how to make it with a pasta machine
• Pineapple, how to cut
• Pot Cheese, make it from yogurt
• Prune Puree, how to make it
• Rice, how to cook
• Soup Stocks, making them
• Trussing a Chicken
• Turkey Preparation