Well, the basic idea for snowshoeing is the same as walking, so for the most part you'll have it figured out really quickly.
Make sure you don't bridge things with the snowshoes (e.g. step directly on a log with your foot, don't try to set the tip or tail on the log).
Stay away from trees (tree wells can suffocate you just like an avalanche).
What kind of terrain will you be in? Mountains = highly technical snowshoes like the offerings from MSR, Atlas, Tubbs, etc. Flat land with super deep powder may benefit from "traditional" snowshoes, huge wooden shoes with lots of floatation.
See if you can find places to rent, or maybe see if you can find groups that have classes of some sort. That is a good way to try before you buy.