To break this habit, you will have to get up very early one morning (when you have plenty of time), and get your puppy out on a walk before it has had its morning wee. You should not bring it home until it has been forced to go out of desperation. If however, you are unsuccessful, and your puppy has not toileted, then take it immediately into the garden on your return, or you risk it relieving itself indoors. Need more help? Follow these additional puppy training tips (e.g. socialisation techniques to prevent behavioural problems).
When you're playing with toys it's the same thing: his teeth mustn't ever touch your hand. If they do you say "Ouch!", kind of the same way his little mates would, and turn away from him. So if you feel his teeth on your hand at all you let him know with a little "Ouh!", turn away and let the game stops for a few seconds. Make sure to speak up every time he bites too hard so that your puppy can learn your threshold for what is acceptable and what isn't. Then go back and play again but he has to remember not to use his teeth and to be more careful next time.
Think Like a Dog: How Dogs Teach Us to Be Happy in Life and ...books.google.co.uk › booksbooks.google.co.uk › books