If you are going into the backcountry we highly recommend that you take a course on avalanche safety.  Having said that, online resources that you can go through in your own time, as many times as you want, will add a great amount of context and fill in some crucial gaps.  Salomon has a new Backcountry Series on youtube, and here are a couple of videos that you might find interesting.  

How to use your Beacon, Probe and Shovel

This video looks at the basics of how to use a beacon, probe and shovel.

Basic Avalanche Rescue Technique

This video walks through a simulated avalanche incident, and the process that you should follow to perform a rescue.

And finally, go out and practice this stuff!  Do yourself a favour and time yourself the first time you try it, and then again at the end.  You won't believe the improvement you will see after a couple of practice runs.  

Happy Trails