Ok, so my dorm room has internet provided but our Resident Advisor said we must find our own ethernet/router. There is an ethernet jack on the wall and I just have to hook up my ethernet cable to it and then plug it into my laptop and I get internet. However, my roommate and I are getting a router. Do I just plug in the router to the ethernet jack through an ethernet cable and hook up the router wirelessly to our computers? Do I need a modem?