Hi. You are very brave taking on two pups at the same time.
It is really important that each pup gets time alone with you so that they bond with you rather than each other. I would suggest that one is put in their crate, given a stuffed kong or occupied by someone else whilst you cuddle/play with the other one. This will also reduce guarding as you don't want it becoming normal behaviour.
There is a really good fb page called Dog Training Advice and Support. They can answer your questions and have lots of files you can read for advice.
Good luck!