You hire Judith Miller to write about WMDs. Then get 'quality' news to publish it. https://en.wikipedia.org/wiki/Judith_Miller The cost of the NYT's 'disinformation' about Iraq was a war that cost hundreds of billions and thousands of lives.
Another thing no one talks about? The massive consolidation via mergers and acquisitions in the media/journalism world. It's been show multiple times that ownership is used to influence those things, but when those ownerships become monopolies owned by fewer and fewer oligarchical uber-rich, there are less and less voices in the wilderness speaking truth.
What I do is find a truth teller and read all his or her stuff. Robert Fisk, Seymour Hersh, Glenn Greenwald, Noam Chomsky, Steve Coll, Matt Taibbi, Michael Hastings (assassinated), Gary Webb (assassinated), Jeremy Scahill, Richard Grove, and John Perkins are just a few on my list.