Just got a contract with Varsity Tutors: How do I get clients?

So because of the COVID-19 outbreak, I'm back from college for the remainder of the semester and thought this could be a good way of making some money while I continue my studies. I am a tutor for a bunch of different physics classes and calculus, and got my contract yesterday. I didn't get any opportunities for any clients, and I'm just wondering when I can expect to start tutoring? How often do opportunities come around? Is there much to do on my part, or is it just playing the waiting game? Any advice would be great.