You can begin practicing for a modeling career immediately. Look for videos of professional models and study the way they move and pose. Imitate and learn from these videos. You can craft your runway walk in front of a full-length mirror if you have one.
If you don’t, try your local gym or dance studio. You might also pay attention to your diet and exercise, since certain types of modeling require you to be within a particular weight range and have muscle tone. Regardless of this, modeling can be a very demanding career. Maintaining a healthy lifestyle will help you stay mentally and physically well.