Choose Composition > Make Movie. Specify a name and location for the output file, and click Save.
Choose Composition > Add To Render Queue.
Drag the composition to the Render Queue panel.
When an output name and location have been set, and render settings and an output module have been selected, the entry in the Render column will automatically become selected (shown by a check mark) and the status will change to Queued. This means that the render item is in the render queue.
Press
the Caps Lock key before you start rendering to prevent the Composition panel
from displaying rendered frames. By not updating the Composition
panel, After Effects requires less time to process simple render
items with a lot of frames.