
Welcome, Sarah, and congratulations! For right now, you don't need to worry about feeding the babies. They should be just fine, as long as mom is taking care of them. Just keep an eye to make certain that she continues to do so. I would recommend having a joey rejection kit on hand, just in case the unthinkable happens, and she rejects the babies!
As far as handling them, as long as mom is comfortable with you holding them, all is well. Please stay within and eye and ear shot of mom so that she can get to them if they start to cry for her.