I have a phone my employer gave me. The Apple ID still has my old work Id as the Apple ID. How do I get rid of my old work email and use my current email as my Apple ID? Please note:my current email is associates with another Apple device.

You don't need to delete the work ID. Use the article below as a guide of where to sign out of the work ID on your phone and then sign in with the personal ID.

What to do after you change your Apple ID or password - Apple Support.      

When changing to the new ID, there may be some data loss, but you can minimize it. If syncing photos with iCloud, ensure Optimization is turned off in Settings/Your Name/iCloud/Photos and/or in Photos/Preferences/iCloud. Then make sure full resolution photos are on the device/computer. When signing out of iCloud, if asked whether you want to retain data, choose yes. Messages conversations will be lost if they are addressed to the ID. See the article below for other places that the old ID should be removed. See Winston Churchill's response in the below discussion. Also set up Family Sharing to keep access to your apps/purchases. 

 How to switch Apple IDs on your iPhone or iPad.      

How to transfer all files from one iCloud account to another.       

What to do after you change your Apple ID or password - Apple Support.      

Family Sharing.         

Family Sharing - Set up.