What do I need to make a torch and how torch light works?

I am making a research how to make a torch light. This is the materials that I need to make it:
- A battery (2-9volts)
- Wires
- A light bulb
- Something to cover the circuit

This is the picture how it works:

 

How it works?

The electrons from the negative (-) part of the battery must go to the positive (+) part of the battery by traveling to the bulb first  that caused the bulb lights up and the electrons come back to the battery.

This is the video: