Removing an existing Apple ID and replacing with a new one.

I just switched back to an IPhone from a droid. When I set up my new phone, my wife and I share the same email address and Apple ID. Since then , I set up my own email address and Apple ID. I ended getting all her pictures, etc. on my new phone. We also have been receiving texts from each other to other people. How do I take her Apple ID out of my phone and put mine in? I also want all of her pictures and emails to go away from my device only. Can anyone help me??