First line up in a two-point stance by standing up straight with your feet even and spread the width of your shoulders. Then take a step directly forward with your inside foot. Lean forward with your shoulders so that your head and shoulders are slightly in front of your front foot. Turn your head to the inside so that you can see that you are onside and so that you can see the ball when it is snapped.
Your weight should be slightly more on your front foot so that your first step is with your back foot and that you cross the line of scrimmage with this initial step.
Try lining up in this manner on every down until you feel that your hips are over your feet and that you have a balanced stance. Remember that the closer your feet are together, the less stable your stance will be.