Congrats! What fun you'll have with 2 now!
A few things that have always worked for me. If possible have them meet for the first time away from home. That way there's no "territory" issues. Don't carry the puppy up to meet the older dog, it's best that they walk up to each other. If any aggression is displayed by the older dog turn and hold her so that the puppy can smell her bum. Or vise-versa. Again, it's best if it's all done on the floor, not being held in your arms. As far as giving treats and affection, I find it best to alternate, I don't always give the treat first to the same dog. Sometimes the older dog gets it first sometimes the new one. And I always find time to do something just with the older dog. Walks by ourselves, running an errand, cuddle time in a different room away from the new dog.
Boo is Gracie's favorite chew toy.
But there are times when he just wants to sit and cuddle with me. Gracie, of course, simply wants to chew and play. If Boo has come and asked for cuddle time, I will move Gracie back and tell her no. It only takes a time or two and she will either go find something else to play with, sit and wait for Boo to get up or come and cuddle on the other side of me so that she can have some quiet time too.
Just remember - you are the boss, stay calm, speak with an firm voice, don't allow either to bully the other. Babies sometimes don't know when enough is enough. Let them work out the little squabbles on their own, just watch that it doesn't escalate into a full blown fight. Trust me, you'll know the difference.
Oh, and post pictures as soon as you can!!!