1. What stages does a film need to go through to be successfully made ?
Film industry process
What stages does a film need to go through to be successfully made ?

2. Pre-Production , Production and Post-Production
pre-production means everything that comes into the process before the film is actually filmed. This includes things such as script writing , finding a suitable location , auditions Etc. Etc.
Post-production is the process after shooting the film in which it must be edited and advertised leading up into the distribution of the film .
Production is the process of shooting the film this requires people to be working on camera audio and action and directing meaning there are many people involved on set and off.

3. What are the different roles?

4. Pre production Script writing
Location manager ,unit manager , location scout
Story board artist
Casting directors
Costume designer
Composer
Prop maker

5. Production Camera Department Camera Assistant Camera Operator
Camera Operator (Aerial)
Camera Operator (Jib Arm / Crane)
Digital Imaging Technician
Director
Boom operator
Producer
Assistant producer

6. How does a film get funding?
A number of governments run programs to subsidise the cost of producing films. For instance, until it was abolished in March 2011, in the United Kingdom the UK Film Council provided National Lottery funding to producers, as long as certain conditions were met. Many of the Council's functions have now been taken over by the British Film Institute. States such as Louisiana, Massachusetts, New York, Connecticut, Oklahoma, Pennsylvania, North Carolina, Michigan, and New Mexico, will provide a subsidy or tax credit provided all or part of a film is filmed in that state.
Governments are willing to provide these subsidies as they hope it will attract creative individuals to their territory and stimulate employment. Also, a film shot in a particular location can have the benefit of advertising that location to an international audience.
Government subsidies are often pure grants, where the government expects no financial return.