On a first look someone who has not run content-marketing before will say: „WOW...great...no work for me“.
My experience in having run content-marketing campaigns for various products is that you really have to define what you want to achieve with the content. Otherwise it is a waste of time (huge factor) and obviously money which you would have better spend running ads.
Do you want to purely do SEO content to drive traffic to your site? Possible with an outsourced service.
„You don't need a rocket scientist to plan out your content.“ Wrong. Wrong. Wrong.
Do you want to build an audience around your company/brand? First: this is a gigantic time/resource commitment which MIGHT pay off longterm in a big way. From my experience this is very hard to do right using someone external who is not in someway affiliated with the company itself.