This is not the right way to get clients.
Since you are a student at Oxford college i really feel sorry for you. You need DD3 and DD4 to get the clinical points. So where can you get this clients? Welfare ....
Get a list of their contact numbers from the city offices at yonge and Eglinton and start calling them

Not only you should not charge the patients nothing but you might have to go pick them up and drop them off. Asking online if someone wants to get a cleaning for $30 is ridiculous in your position. I have been there and i can tell you its not fun.
You might fail and repay $7000 to repeat the semester and you worry about $30 client fee???????

You want my suggestion? Graduate as soon as possible from that horrible school or they will make you pay thousands more.