Most of all, your video is never complete without a call-to-action as your final slide. You’re not creating video ads just for the fun of it, though it is fun, but because you want to lead your audience to do something. Clarify what you want them to do and exactly where they should go after seeing your add. The standard best practice would be adding your business logo, tagline and your website or link for that unique campaign.
Here's where the final lesson of composition comes in: continuity. Continuity is the process of combining shots into a sequence so that they appear to have happened at the same time and place. A key part of continuity is making sure any ancillary objects in the scene — for example, a cup of water on a desk — stay in the same place (and have the same amount of water) throughout all of the shots.
When it comes time to shoot, clear out unnecessary people from the room and turn off the overhead lights. With your three-point lighting setup, there will be no need for those harsh fluorescents. When — and only when — everything is set up, call in your talent. There's nothing worse than being nervous, and then having to anxiously watch as lights are turned on and the camera is tested.