Introduce them in a neutral area, not your house or property.
Introduce them on leash. Try to remain calm so they don't feed off your excitement. Then take them for a nice long walk together. Walking them together helps with bonding.
Is this pup dominant or is he more submissive? It is not a good idea to bring in another dominant dog. That can create fights in the future.
Sinister "The Prince of Darkness" 4 yr old black male GSD 3.11.09
Draco "Dakota's Unbreakable Vow" 6 mth old male Dalmatian 6.30.13
Cats: Chaos, Mayhem, Monster, Wicked