With Laurel, don't be afraid to keep it cut, you can't harm it.
As soon as you plant them, about 18 to 24 inches apart for a thick hedge, pick out the tops of all the shoots, that will encourage growth from bottom.
Keep them picked out until the growth is filling out from the bottom, then let them grow up a bit. If they start to become leggy, cut them down a few inches, they will start to thicken up again.
You can keep them in leaf right down to ground level.