Lights! Find a quiet room with ample lighting. It might take a bit of trial and error to find the right place but it will make your video all the better. If you have a desk lamp, you can shine the light on yourself and voilà, great lighting.
Camera! You can film your video using a video camera, a computer webcam, or even a cell phone!
Practice! Make sure to practice before you film yourself. No truer is the proverbial saying than now, practice makes perfect!
Action! Two minutes or less is a great length for your video.