Puppies can get into all kinds of mischief. Remember that in this regard they are just like babies and toddlers, so be patient with them and puppy proof your house as much as you can. If possible, remove tempting objects from puppy's reach.
Common problems are play biting, jumping on you, digging, chewing and stealing items. The best thing for you to do is to start the training early (14 weeks and older). This will help you set the rules and earn the dog’s respect.