Using the right amount of rosin is essential because, without the right amount, your bow will not move efficiently across the violin strings. I advise you to start slowly. It is much easier to add rosin if you have too little than to take rosin away if you have too much. However, if you have children in your family who are just starting with a violin, be prepared for a mess. Maybe put a cloth down underneath their instrument or on their lap when they rosin their bow to catch any of the dust.