Welcome to YT! Congrats on getting your new one.
You've received some great advice so far. I would definitely see if you can get something with the new puppy's smell on it before bringing the puppy in..then letting your 13 year old sniff it while you pet him. If you can do that ahead a time for a few days, great..if not..do it before bringing the puppy in the home. When you bring the puppy in the home, bring it in butt first and let your older dog smell it's butt first. Then, I would go into a closed off room where you can easily control/get to them but let them both on the floor to interact. See how it goes.
My only other suggestion is to ensure the puppy stays with mom and siblings for at least 12 weeks if the breeder doesn't already do this...ask the breeder if you can do this. It really helps the puppy's transition by giving it social skills and emotional strength.
Congrats and can't wait to see pics!!
