200k database (email, mobile.number) students worldwide

I want to consult with you about the following topic (I hope I am at the correct address). I have a database of a group of students spread from Canada to New Zealand. I have their information (name and surname, phone number, email, fax, where they study, which country they are from, which country they are learning from, which year, etc.). Now I am interested in what you suggest, how I should sell, whether a service or a product and how to get in touch. Whether you use email marketing or, say, Viber marketing through groups. I am in a dilemma, and I need help. If this whole idea, the mosaic, goes together, it can be very nice to make money because it involves many students. Or we can sell that base; that's also possible.