Hey there!
i had a similar situation to yours where i had to introduce a puppy to a larger dog as well.
What i did was this, allow some time for them to sniff each other out..once they know each others' smells, they'll calm down a little. Next, when you let them play together just remember that sometimes when dogs play, it looks a lot more violent to us but to them it's just playing. However, pull the dogs apart when you see either dog lunging at the other dog's neck, teeth bared or if either dog growls or gives a warning bark.

Also, give both dogs equal attention. I actually had to give my bigger dog slightly more attention at first since I didn't want him to feel like i had replaced him. Doting on the puppy is just going to make your other dog feel neglected, depressed, jealous or possesive of you--leading to a lot more fights.

Finally, i would recommend you give them each their own space for their crates (that is if you have crates for both of them). Feed one dog on one side of the room and the puppy on the opposite side. That reduces a LOT of jealousy and 'hey this is MY space' possessivness.

Good luck with the doggies! I'm sure they'll be buddies soon.