That is very good to know Tanveer Bhai ...
Now, before you apply the coat to the doors, first step should be to "super clean" all the surface. The car has spent almost two years in Karachi, and you might have to work really hard. While some door parts are easy to access, if you intend to do it fully, you will have to reach out into blind areas. I suggest you should keep a torch with you ...
... and
and make sure you are wearing clothes which cannot be classified as "clean"