When adding a new four-legged family member to your home, it's important to ease your pup into the space. Slowly reward your pup with freedom throughout your house once he's earned it.
Many pet owners make the common mistake of giving their pup access to too much space, too soon. This can lead to accidents (that you might find much later in an infrequently used room... eeew) and other unwanted behaviors (chewing furniture, etc.). When you're home, start by keeping your pup leashed to you so that you can pay attention to his actions (if he needs to go potty, he starts chewing something, etc.). If you aren't able to keep a close eye on him, shut the doors to unused rooms and put up some gates to section off safe areas of your house (you can also put him a kennel if you want to crate train). Make sure that he has access to water, a place to sleep (like a soft pet bed), and some dog toys or treats to keep him occupied. Gradually reward him with access to new parts of the house once he's earned it.