Becoming a Publisher is like this:
1. Call yourself a publisher.
2. Do the work of publisher (for books, it’s printing)
3. Register with organizations like ISBN (web form)
4. Set up your business license (like any other – both local and state if US)
Isn’t a publisher somebody who just publishes something?
If my sister writes a book (in a MS Word document) – and I tell her I’ll Publish it, it might look like this:
I’m going to put roles in parenthesis – a publisher might hire or contract these roles.
1. Edit the book so that it flows properly (editor)
2. Design a cover including copy, images, isbn numbers, bar codes (designer, copywriter, admin, designer)
3. Flow the text into a book layout (designer)
4. Register the publication with Library of Congress, and other places that list publications (admin)
4. Print the book using the files from steps 2 & 3 (printer / designer)
5. Promote & market the book (public relations, marketer, web designer, copywriter, designer, printer etc.)
6. Account for sales (accounting)
7. Pay Taxes (accounting)
8. Network like crazy so people know you exist (sales person)
9. Make sure this is all happening (CEO)
There’s an excellent, excellent (yes 2) breakdown of the things you need to do. Dan Poynter (parapublishing http://parapublishing.com/sites/para/)
He’s done this for many years and his material will give you the confidence to do it all yourself.
So, go for it!