For purposes of Free Publicity, you will want to create informational articles and opinion pieces, for publication, and to form the basis of interviews. Of course, it hardly makes sense to make any free publicity efforts before you have products and services ready-made to market once the wave of visitors arrives at your website as a result of all your free publicity, so make sure you develop your product line thoroughly first. Also, well-thought out and articulated opinion pieces are often picked up by national publications, especially if the opinion is controversial, or on a subject of current national debate. Then you can develop your materials in such a way that you dramatically increase your chances of getting published. Visit websites, check out back issues, and read FAQ's where available, to find out the procedures for submitting articles.
Most places have length and topic requirements for submitted articles.
Follow these scrupulously if you want to get published. I have tried some others, but so far, this one is my favorite. You can search any number of ways, and you get outstanding results, with numerous leads to follow. And then there's the Offline world. Broadcast publicity takes the form of radio and television interviews.