I personally do not like training collars. I hate the prong collar. I find them cruel. Only use the training collar on grown dogs that are out of control. Never strike a dog.
Training is constant.
When you can not be paying attention to a dog place them in their crate. Unless the dog is already trained. Remember a well trained dog is easier to live with than one which hasn't had any instructions. A dog is like a child, it has to be given instructions before it can learn a thing. Training takes time and patience.