The first thing to do when building your stance is to aim the clubface square to your intended target. From there you can build your stance around that, the feet, knees, hips and shoulders should all be running parallel to your target line. Another little check here is to make sure your body lines are at right angles to the leading edge of the clubface. A common trait I see amongst many amateurs who struggle with their alignment is that they aim their bodies first, they tend to aim their feet and shoulders at the target which throws the clubface alignment completely out. Aim the face at something on your target line that is only a few inches in front of your ball. This could be an old divot mark or a blade of grass; this will quickly reinforce the direction your clubface is aiming and where you want the ball ultimately to go.