Do you have access to the back of the storage room walls and ceiling so you can flush mount the lights and switch? Or are you thinking of just surface mounting the light and switch using Wiremold type channels and surface mount boxes?
The first way will be a more professional way to do it, but require more work and access to walls and ceiling from behind the room. Also, once you cut the holes for the lights and switch box, you can't really change the layout easily.
The second way is easier, requires only a single small hole be drilled in the walls/ceiling to get the wiring from your power source to the room, but the end result will look a bit more industrial. Which is not always bad for a closet. And you can also modify the locations of the light and switch pretty easily if you want to move them around.
Here is a picture of a motion sensor light switch I put in my basement stairwell. The wiring was never put in at the top and bottom for a 3-way switch setup, so I installed this motion sensor switch in a Wiremold box on the wall where the original switch was located. I put the Wiremold box on the same angle as the stairs so that the motion sensor would pick up motion at the top and bottom of the stairs and turn on the light.
My wife loves it because she no longer has to try to find the light switch in the dark when she is taking laundry to the basement and her hands are full, or forget to turn the light off once she comes up from the basement.
The motion sensor light switch and Wiremold box are on the left side of the picture. The picture is looking down the stairwell from the top with the basement door open.
Jim