How should I get my hamsters to live together?

We had one female hamster for about five months, and we needed to get a new cage so I figured I would get another hamster. She’s pretty young. How should I bring the two hamsters together so they don’t fight and can live in the same cage?
Oh, I forgot to say they’re both teddy bear hamsters.

What 2 hamsters can i buy that will be able to live together in the same cage?

I am going to buy some hamsters on the weekend. I’m going to buy 2. I want to know what kinds of hamsters i can buy that would be able to live together in the same cage.