Pre-production Stage of Film Making

In pre-production, every step of actually creating the film is carefully designed and planned. The production company is created and a production office established. The production is storyboarded and visualized with the help of illustrators and concept artists. A production budget is drawn up to plan expenditures for the film. For major productions, insurance is procured to protect against accidents.

The producer hires a crew. The nature of the film, and the budget, determine the size and type of crew used during filmmaking. Many Hollywood blockbusters employ a cast and crew of hundreds, while a low-budget, independent film may be made by a skeleton crew of eight or nine (or fewer). These are typical crew positions:

source:Wikipedia