The following is a list of some of the questions I ask potential clients before commencing any prodcution. Although I use these questions more for assistance in determining the correct budget for production, I think they could help you with production/project management plan preparation.
What are your main objectives. (ie. what problems do you want to solve through your video)
Who is your target audience? List all relevant (ie: employees, investors, contractors,etc).
What are your main communication messages?
In what countries will the video be shown? Include whether they will need any regional translations.
Would you like us to research and write your script?
If no, would you prefer us to check your script to make sure that it works for television?
Will your staff feature or will you need actors/models? If talent will be required, how many? And do you need us to scout talent?
Where will the filming be undertaken? List all locations.
Do you have any footage that we can use? If yes, what is available and in what format?
How many days filming do you estimate will be needed
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Are any special graphics or animated sequences required. If yes, briefly list the requirement.
Is there an established budget for this project?
Is there any additional information you believe we need to know.