The Earth I am currently talking about is also earth with almost the same details. The only things I would change or make up is cities and towns and some geography. I have been using 1,2 and 3rd person view on this, not sure which would will be better.

Some spoilers if you haven't read towards up to chapter 4, the people are already infected. The sun and the rain is a way of creating zombie. Other beings would come up as other mutation haven't been made yet. I will probably add other myths and legends into the story.