Do I need the camera object and the light object? I want to create a 3d game with Unity so I started to learn Blender, but something that very annoy me in the 3d view window is that camera object and the light object. are they essential for modelling assets for my game or they are just for making movies? 

so will it be ok to delete them?

thank you in advance.
you can delete them now and readd any number of those later on if you'll need them.

also you can hide them - there is a list of scene objects in the upper right part of the UI, click on the eye icon next to those things to hide them.