It is unlikely that others will want to write content on a brand new blog. Typically, the blogger must create quality content for a specific topic and build an audience first, and only after that will others be willing to write guest content for you.

There are 12+ million established blogs and probably 30+ million installed blogs. There is almost no benefit to other writers to spend time writing for your site. They are much better off writing on established sites or creating their own authority content.