In this video, BCA ambassador and American Avalanche Institute (AAI) co-owner Sarah Carpenter goes the through the typical steps you'll need to perform if your companion gets buried in an avalanche. Make sure the avalanche scene is safe, appoint a rescue leader, delegate tasks, and search for the avalanche victim. Be prepared to provide first aid and evacuation.
This is not a substitute for an avalanche class. Get educated before heading into the winter backcountry.
Find a list of avalanche courses here.