For all I know, for this situation only W9 form is required. My friends had similar case and they filled only this form. I think it's better for youto read itmore properly by yourself in the Internet or appeal to the specialists in your city. If you're dealing with it on your own, then I can give you a piece of advice to read about that here https://pdfliner.com/form_w_9 (you can also fill it). Maybe it'll make the whole process easier for you!
