Don't ever forget that YOU should always remain the pack leader. The b's should look to you as all powerful, fair and consistent - never angry. Be proactive, but do respect their pack order and don't try to change it. Sometimes, puppies can annoy an older dog, but since your guy is only 2, he'll probably look at this pup as a new toy! Good advice from eeeefarm to get them together on neutral ground. Keep them walking and once they can sniff and walk in near proximity of each other, you can let them do the same in the back yard. Before bringing the new guy home, pick up all items (chew toys, beds, bowl of food, etc.). Boys will squabble and usually forget, Girls seem to hold a grudge longer than boys.
Be prepared for hours of entertainment, watching these two play!