[MRM]

The basic formula to break into the writing end of things is to write as much as possible and use your writing portfolio to interest an agent. The agent is the one who has the connections to get you in the right place at the right time to succeed.

When you start writing professionally you aren't necessarily expected to start out with a finished product. Instead, you'll probably get a story idea. You'll do an outline of the expected story line with a profile of the main characters and an overview of the plot and sub plots. You fully write the intro and a few scenes inside the movie/story so the people who review the material get a feel for the final product. You circulate this treatment and see if their is commercial interest. If there is, you finish the story. If not, you move on to a new project.