PEOPLE, either post to help, or do not post at all...
Since 'a' ball is just one way to reward. This is a good opportunity for you to start training like most of us do. With reward based food marker training. Clearly much easier with a clicker but we humans tend too be to lazy to learn to use it (much easier to expect all the training to be on the dogs part I guess
So with that said I'd just review this ---> Teaching a trick is the least important part of teaching tricks
and Intro to Clicker Training (perfect for puppies!)
and you should have a great week!