Do I still need an initial meeting to inform students about the course contents and prerequisites? Do I need to change my application process for my seminars?

Nothing changed in the way how you provide information about your course. There is also no need to change anything in your application process! You just enter the selected students in the matching system. This should mainly avoid having students register for several courses and then drop out in all but one. Also, the initial list of assignments is based on information about the complete list of preferences of the students, which should lead to a better and more stable matching (see also previous question).