See the available projects page for the list of currently available projects. You can pitch for several projects at a time. Having the pitching system allows the client to learn more about your writing style and process and helps copywriters to understand what the client expects of them. This also drastically reduces the number of client declines and refunds.
Please note that clients often select multiple pitches per order (sometimes all the pitches that have been submitted by multiple writers), and also it sometimes it takes up to two weeks for a client to select a writer and award a project.