How can i model a camera for my drone ?

Can’t find any tutorial/s

I want to model a camera so later i can export it from blender and import it in unity3d as object and then use it in unity3d.
I exported my drone and i can use it in unity3d rotating and make stuff with it.
But now i want to model a camera and then add the camera as object in unity3d on the drone.

This is the drone in unity3d. I wonder how to model a camera for that in blender.