As you plunge into your first draft on any project it’s imperative that you allow your characters free rein to wander where they want to wander. To let them surprise you as they find their rhythm and start wanting to go places you haven’t charted for them to go in your pre-draft work. In other words, give them some rope…
This is an essential requirement if you ever hope to write a script with a sense of spontaneity and that comes fully to life. And it’s what keeps the writing of that draft a true adventure.
However, there is one caveat.
To keep your characters from getting hopelessly lost and turning back to you for guidance (which they most certainly will), it’s equally imperative that you have a well crafted plot outline worked out beforehand that supplies a basic road map to get you from the starting gate of your story to your final destination. It can never be written in stone, but it should definitely supply a charted path from beginning to end if and when you need it. Because this is what frees you up and liberates you–by allowing those wonderful characters you’ve fallen in love with to take as much rope as they feel they need as they journey through the wilderness of your first draft.
And then when they do get lost, you have the means to pull them back on track.