I've been looking for someone to grow a blog, but I'm not sure if I'm going to hire a freelance or use a service like this. Is there a plan where I can choose

I've been looking for someone to grow a blog, but I'm not sure if I'm going to hire a freelance or use a service like this. Is there a plan where I can choose how long the article would be and the depth of the research made? Can I share the main points the article should contain and build the content around that?