Write article about online/ freelance virtual assistant jobs

I am looking to get a detailed well written article on english virtual assistant jobs for workers in the developing countries. It should cover;
1)what the virtual assistant is about what they do and the various types
2) list of 50 companies that accept virtual assistants from Africa and pay via PayPal
3)highlights/statistics of success stories and countries leading in providing virtual assistant jobs. Indicate the average pay for virtual assistant freelancers