In the first source it talked about that in 1910 they only had one screen in the cinema to watch the film. They would pay around 5 cent to get in. They didn't have exact show times. People would be able to sit in the cinema all day this was called continuous loop this means that they could watch short films and cartoons. 1913 is year would be considered as year zero. In new york city Nils Granlund who was the advertising manager of Marcus Loew theatres. The made a short promotional film for the broadway play called pleasure seekers. Pleasures seekers showcasing actual rehearsal footage. The idea of showing ads between the films was a hit at least to the movie theatres. The practice of creating and splicing in promotional pieces into the screening rotation was quickly implemented by the Loew theatre chain as well as others. 

Around the same time in Chicago Colonel William Selig was one of the films earliest pioneers that would engineer another way to get the audience to watch the film. Selig noticed the popularity of the print serials in newspapers so he went to the Chicago Tribune which is a newspaper that embattled in a circulation war for who could be the most sensationalist to adapt the film version of a print serial. There were 13 episodes serial called The adventure of Kathlyn. This was the second serial created. It introduced a new device to film marketing. Each week there would be a new installment would debut along with an article in the Chicago Tribune that continuing the story. The adventures of Kathlyn was different at the end of each instalment something would happen to characters. The cliffhangers often with a title card inviting patrons to come back the following week. The idea of film trailers was born and the term as these promotions for upcoming attractions would play at the end of the film. Most production was produced by the theatre themselves. When people think of the power Hollywood we often think of large sounds stages and studios set. Anyone anywhere in the world with the  right amount of capital can build a movie studio. Before the internet or even reliable phones service coast to coast, distributing the movies and promoting the trailers and posters were a nightmare but the main studios were happy to outsource to a company called the National Screen Service.The NSS started in 1919 by Herman Robbins. The NSS opened an office in New York city that movies stills, spliced in titles and turned around and sold these trailers to the movie theatres directly. They didn't ask permission from the studios. Many studios happily signed deals to submit their films NSSto be made into trailer.