I am new to HR. My company hires consultants as W-2 employees usually. However, we are now going to hire some as 1099's. What paperwork do I need to hire them, just a W-9?

I am new to HR. My company hires consultants as W-2 employees usually. However, we are now going to hire some as 1099's. What paperwork do I need to hire them, just a W-9?