Adding the Longe Line

When you have your horse moving forward, stopping and changing direction in the round pen, go ahead and introduce the longe line. Attach the line (at least 20' long) to the web halter.
A rope halter is not recommended. And a stiff rope halter that applies pressure in more than one area is espeically discouraged. Why? All that pressure is painful and confusing to your horse.
Remember that your training, especially at first, needs to be as firm as necessary but as gentle as possible and -first and foremost - simple.
Don't create unnecessary distractions or introduce painful implements that will impede your progress and disrupt your success.