After your project plan has been accepted by the course manager, you can formally start working on your project. To not waste time it is however recommended that you start with literature reading before you get feedback on your project plan. You have already received feedback if your idea is suitable or not at the discussion seminars. The project plan is not about IF your idea is okay, but rather HOW to carry out your project and set scope and limitations.
The project work runs between course weeks 6 and 19. During the project work it is important that you, the student, keep regular contact with your supervisor and inform about your progress. Also take a look at your project plan every now and then to see if you are on the right track.