How to change from one account to seperate on iPhone 5? Phones alraedy set up using one accont.

My wife and I have seperate iphones (5's) that my son set up for us two years ago. He used one account saying we could share the purchased music. We have never purchased music or paid for apps in the two years since. About a year ago I had a iPad from work and set up my own Apple ID on that account but have since retired and returned it into the company. With the installation of 7.0.4 things changed and all text messages sent from my iPhone arrive as hers (to other apple products) as both phones have the same Apple ID. Can anyone give me help on changing over my iPhone to my own Apple ID? If I delete her Apple Account on my iPhone will it wipe out her entire account, or just on my iPhone? I have already added my own email apple ID to my phone. Will deleting her apple ID on my phone delete all my APPs? Any help would be much appreciated!