All positive commands should be spoken sharply and distinctly during training. Make sure you also use a positive tone. Your dog will recognize your moods and associate them to their behaviour by your tone of voice.

The first word the puppy should learn is their name. They actually learn the sound of their name and associate that as a directive towards them for their attention. This will come naturally over time since the family will be calling the pup by its name the day it arrives in your home.

I suggest that before you start training verbal commands that you understand your puppy