Do you know how it is to work on a big project and outsourcing works and parts of jobs
Oh yes, I have been doing it for years.
Quality control becomes one of the major components of such an undertaking.
You better budget serious time for that!
Stealing content is not acceptable.
There are plenty of writers online working for very little money and writing completely original, quality content.
Hire some decent folks, treat them well, and you’ll have a decent site.