What happens at the start of a film?

At the start of any film, the film usually start with the distribution along with the production who made the film, then who stars in the film. And sometimes, some film add credits to the people who helped making the film along with the director and the producer.

So they'll add :

• The editor
• The Music by
• The director of photography/cinematography 
• The costume designer and many more  

This would be an example of the opening of any marvel films. 

Another example of the opening credits of Fast & Furious 6

This would be an example of an opening credits of who stars in the film.

Another opening credit of who stars in it. (R.I.P Paul Walker)

Then they will show the title of the film when everyone is waiting to see it.