I might be getting a new puppy! I have two dogs already!!! How should i introduce them?

I have been looking at this 6 month Labrador female puppy for a few weeks now. I have a 11 year old Belgium Sheepdog and a 2 year old Golden Retriever. My Golden loves dogs but my other dog only likes females. But the good thing is that i have found a female :) Tips please i am not worried about my younger dog just my older one. He was good with Siwa but how do you think I should do the meet?