Sit is fairly easy. Get a treat that your dog likes. Hold it infront of him and slowly move it above his nose. Usualy the dog will follow it with its eyes and sit down. When you do this say sit so the dog remembers the word. (If you have trouble just push its but down.) Lay down. Once you teach your dog sit make it do it. Then clutch the treat infront of the dog and pull the treat to the floor to the dogs feat. As you do this say lay down. The dog will follow the treat with its nose and do lay down.