FUNDAMENTAL VIDEO TIPS
Whether using ambient light (e.g. The Sun or direct light from a window) or artificial lighting devices, the light source should shine upon the Subject's face.
Unless you have a specific reason to use one over the other, TRY BOTH, to see what would work best.
Don't neglect the scenery behind the Subject. Make it interesting! But, don't make is distracting to the Viewer.
The top of your Subject's head should almost touch the top of the frame.
Use the Rule of Thirds to position the Subject in the frame.
Remember, Sound should take priority over the Image. Get as close to the Subject, as possible to get good Audio.