Ask HN: Hire remote worker, basic questions

Hello everybody, I am planning to open a e-company in Estonia, and I will need also some freelance help. I have a big pool of trusted talented people that I will be very glad to employ but none of them got a real business, they don't have a VAT ID. How does it works in this cases? Can I employ them with a fixed contract ? What is the standard way to proceed here ? Thanks