The most important thing about open receiving is where you arms are and your ability to move on with the ball. When receiving, let the ball roll with the stick so you have forward motion. The positioning of your shoulders are very important, when you receive, turn your shoulders so they open up in the direction you want to go.
When receiving open, let the ball roll a little bit further as it will allow you to go further much faster. When receiving from the left, allow the ball to move past your left foot and on to the right foot. Before you receive, have your feet pointing in the way you want to go (once you see the ball coming, turn your feet).