Onboarding question for a freelancer?

I recently graduated with my MA in Translation. I applied to a freelance job at an agency and have been in the beginning stages of the hiring process. I provide my references and diploma as they requested and they want me to now complete various onboarding documents.

I have only applied to in-house project manager positions with a standard hiring process. Is it common as a freelancer to not have any interviews when becoming a freelancer for the company and just email contact?

Thank you!