After you have succesfully completed your preparation phase you can begin your graduation project. You will need to hand in your graduation plan to ask permission to start your graduation.
During the pre-study you already developed the graduation topic and a project planning together with your supervisor. You now also arrange the supervision method, including how often you and your supervisor will meet to discuss progress.
In general, the graduation project should be completed within 6 months from the start. You complete your graduation project by writing a report about your project, and giving a public final presentation. The defense following the presentation, however, is not public; only the student and the assessment committee are present.