That's easy: DON'T.
Two puppies will bond to each other, not get one on one time, have double the problems, and double the costs. Like having twins, they talk to eachother in their own tongue, ignore you.
Getting two puppies at once is almost always a bad idea.
As a rule of thumb, two years between pups.
If you really want two puppies, don't get girls! One of each is best, but not two girls. And when one becomes a bully, let it. If you try to force them to be equals you'll start fights.
I won't say that two puppies can't be done. I will say that human companionship is more vauable to a dog than canine.