Just started a Data Scientist position on a company that has no structure, need advices

As title. The company is creating a product for PII detection, and they only have other data scientists working within the company, each one on its own project.

I was assigned this project with only one requirements doc, and I need to develop the whole thing from there. Nothing is quite clear, is all about desires, I really am lost on that, never worked on a company with no structure as this.

There is no project manager, no Agile methodology, …

data datascience data scientist data scientists detection pii product project requirements scientists