Dogs can be trained in differnt methods. Treats work for some, other will refuse after you think they are trained when they don't get a treat.

Sit: hold a treat in your hand, say sit and bend you arm over at the elbow, the dog will naturally sit.

Stay: tell the dog to stay and walk away if it moves take them back and tell it to stay...reward if they stay.

Down: Same as sit move the treat toward the floor.

Release: tell the dog to drop, release, or leave it and then blow in it's ear.

If the dog jumps on you, knee it in the chest and say No. it will break the dog of jumping.