How do you decide which trailers show up first on the Trailers page? Can my trailer be moved to the first row?

The newest (most recently released) trailers show up first, as freshness of trailer is the default setting for this page. You can alter the setting to reflect the most popular trailers first. Popularity is gauged basis the total number of votes received on the page for ‘Will Watch’, ‘Won’t Watch’ and ‘Maybe’.