A literary manager in Film and TV will help with everything in your career. Beginning with the logline, to an outline and first draft of the script. The literary manager is a partner from development to production – the manager will take the project to partners, look at the deals and they can produce and package the project.
The literary manager is focused on your overall career trajectory. Where are you now, where do you want to be and how can they get you there?
A literary manager can help you get an agent and will often work with you before you need that agent, helping build your career.
A literary manager can negotiate deals if licensed (in the US).
Overall, a literary manager focuses more on building you and your career versus selling your work.