Adding Admin Panel in MVC 5 with Database First Approach

Question

Question :- Do I need to create  different Models for Different Areas in ASP.NET MVC 5, EF 6 Database First Approach?
Description :- I want an admin Panel in my Existing MVC 5 EF6 Database First approach Project. I googled it and find many tutorial. I find the Best approach is to create an Admin Area but found that all the different areas have different Controllers, Views, Models. My Problem is i used edmx file which i added in default Models folder. 
I'm newbie to MVC ....
Any explanation or Tutorial or Suggestion for best approach will be highly appreciated.
Thanks
ROHIT