As a family, you need to decide what you are happy for your puppy to do. Is he allowed to sit on the sofa? Is he allowed to go upstairs? Is he allowed to jump up at people? Remember, it may be cute to have your eight week old puppy jumping up at you, but will people find it cute when they are about to go out, and he jumps up weighing 35kg, soaking wet and covered in mud?
Dogs learn by repeating behaviours which gain them a benefit. For example, if you decide you don't want your puppy to go in the sitting room, and each time you chase him round and round, then pick him up and carry him out, he will think that being in the sitting room is fantastic, because you get to play the best ever game when he's in there. He will then do everything in his power to get in there again. If he accidentally gets in the sitting room, and you pretend that you haven't noticed, but squeak a toy or rattle a pot of treats in the kitchen, he will race out to play/receive the treat - much better to be in the kitchen, boring in the sitting room!
Everyone involved with your puppy needs to respond in the same way to unwanted behaviours. Unwanted behaviours need to be boring for your puppy. For example, if some people allow him to bite and chew their hands because "he's only a puppy, he doesn't mean it", your puppy will not be able to learn that this is not an acceptable behaviour and may continue to "chew" people with his grown up teeth and very strong jaw - not a happy scenario. If your puppy bites you, stop playing, and redirect the puppy onto something more suitable to chew e.g. a toy. If the puppy persists an ignoring tactic can be tried - it is better to help puppy to get it right before punishing him for getting it wrong.
Conversely, behaviours that you like should be lavishly rewarded. Rewards can be food treats, toys, games, cuddles, praise or more work (collies and gun dogs!). As you get to know your puppy, you will learn what his favourite rewards are. Not all dogs like the same rewards, and not all dogs like the same treats.