Not enough information.
How long is the video. What is involved with audio, is it a narrative track? Sound bites? Is there a script already written you can look over? Was video shot to the script, or was it run and gun shooting? How many dubs will be needed at the end? What kind of music needed and is it licensed? What kind of graphics and are you responsible for creating them?
And that is just a sample of the questions needing answers, not all of them.
Charlie