All ballet moves begin with proper alignment. The weight should be distributed equally between the two feet, with the ankles rolling neither inwards nor outwards. To ensure that your spine is straight, pull inward and upward with your stomach muscles. The shoulders should not be hunched forward. Rather, pull your shoulder blades down your back, keeping your neck relaxed and aligned with your spine. Imagine a string pulling the top of your head towards the ceiling.
Proper turnout means that the legs are turned out at the hips. Eventually, the feet will point away from each other to form a straight line in first position. Indeed, in all foot positions the feet should turn away from each other. Rotate your inner thighs outward and squeeze them together, remembering to pull your ribs in to maintain a straight spine and proper balance.
Port de bras refers to the way a dancer moves his arms between different positions. It's meant to seem fluid and natural, but it requires substantial control. In most positions, the arm should be slightly curved at the elbow, but not bent at an angle. Arms are either held down and slightly forward, up (en couronne, which means crown in French), out to the side, or some combination of these.The neck is usually held straight but can sometimes be tilted for effect.
Perhaps the most important principle of ballet is that all movements should be executed with grace and control. A good dancer never jerks her arms or legs from position to position, slouches her spine or lands hard on her feet. A sense of rhythm contributes to grace and control -- the music should dictate the proper pace for you to move.Think of all your movements emanating from your alignment, your turnout and your port de bras.