concerning working visa

Hi, i would like to know the procedures for applying a work visa. I have been graduated from china for 23 months already. I am holding IELTS(7) and tefl certificate. I even got my no criminal certificate, my degree documents with me. And for the moment i have a friend who has a legal company and he wants to hire me. I think we got everything that is needed but we don't know from where to inquire to proceed. Could you please brighten us on this? Thanks