Shanghai is an extremely competitive market for private students.   You might trying putting up notices in Carrefour, RT-Mart, Walmart (if they have bulletin boards in Shanghai and that I can't guarantee); additionally, you might try leaving a notice here, on the China Daily forums, etc., etc.  Generally privates come through word-of-mouth and good relations.  Since you don't mention anything about your background, training, qualifications, it is really hard to say what your salary might be -- perhaps RMB 150 - RMB 200 per hour.  Shanghai privates are not always steady and not always dependable.

Next, "forgetting about the visa", well, that's just not a good idea, not these days in any case.