Write a 2-column script for your video.
In the left-hand column of a two-column script you should include the visual aspects of the production. Here is where the content of each shot is identified. Use abbreviations to describe the type of shot, such as "CU" for "close-up," "MS" for "medium shot," and "WS" for "wide shot." Note any special effects in this column. Use GFX for graphic or image. Voice-over (V.O.) is used when someone is speaking while an image or animation is on screen.
The right-hand column contains the audio portions of the production. Write the dialogue, sound effects and music in this column.
The content of the columns should be synchronized, so that the dialogue in the right column matches the shots in the left column.