Preparation is Everything!
When you've got your idea ready to go, it's time to get prepared. This is all still before you pick up a camera (although you may want to try some of your ideas out such as camera angles and movements just like you do in an art sketchbook).
As with the planning stage, the more time you spend preparing for filming, the more smoothly the film making process will be.
|Storyboarding the ideas for your film|
Film Making: a director's viewpoint
Here's a short video which shows you some of the decisions that a director might make when planning and preparing to create a film.