We're all publishers now. If you have a Facebook account and you push the like button, or update your status, or comment on your friend's photo, you've published something. Yes this is a form of publishing. So is pushing a tweet out into the universe. You don't even have to sit down to write a long form blog post.
Used to be that publishers needed to own printing presses and delivery trucks. You needed to pay a staff of writers and editors. Now you can publish and move public opinion with an Internet connection and a laptop.
So if you're going to be a publisher in a digital world what should you do?
1. Publish often. It's next to free.
2. Nurture a small audience. You'll never start off with an audience the size of Huffington Post.
3. Keep publishing. People interested in your subject matter will find you. You just need to be patient.
4. Have an opinion.