I combined mine and my husbands phones by updating thru itunes and we have new iphone6's and want to seperate how do we do this

All of our apps and phones numbers are shared on both phones because I didn't know I had to open the computer to a different user when updating his phone. This happened a long time ago and now that we got new iphone6's which we have not activated yet, we want to know what to do. How do we back them up separately and then put on new phones once they are activated