Stopping
Here's a dilemna. You can't stop until you start and you don't want to start unless you can stop, so compromise.

Learn the Half Snowplow then find a nice gentle short hill and practice going down hill. If all else fails, pick a nice spot to fall. Fall to the side rather than on your butt. Once you have the hang of going down hill try Snowplowing all the way down a hill. You could start at the bottom of a hill and then go up just as far as you are comfortable coming down. Next try alternating between snowplowing and going straight. Here are other ways of stopping