H.S.
I would only reward if he goes potty or pee. Otherwise they will learn to tell you they have to go when they do not have to void. I would not give them candy. I would find a special toy that they really like to play with (maybe one that makes noises when you push buttons and tells you names of things). Then allow him to play with it as a reward. After he learns and is trained, you can give him the toy to go with the rest of his toys.