Please give me some advice. You must not be worried about the fact that you are graduating from a small university. If you have approached your studies with the same resourcefulness and courage it has taken to be an Avon lady in China and to live, study, and work in a new country, you will be seen as an excellent candidate. Your best resource for help identifying companies with financial openings or contacts in companies in the Boston area will be your graduate school's career center. Your university may even have listings of job openings, as well as the names of graduates working in your field who can help.
Most graduate schools consider it a major responsibility to help their graduates find employment.
The career center and the international student office at your university may have additional information as to which companies are most receptive to the candidacy of international students. It's also possible they may even have information that shows which companies have sponsored employees for the H-1b visa. The career center can help you write a resume that emphasizes your experience in China and in the United States, experience that will make your candidacy appealing. The counselors there will have an understanding of which financial jobs suit you given your experience and skills. Finding a position in a company that will sponsor you for the H-1b visa requires a strategic approach.