I was wondering

In all seriousness, I'd start by obtaining an English degree. Then I would consult an online job hunting website and type in keyword PUBLISHING. Seems logical enough...

While you're doing a degree it's pretty easy to get an internship with a publisher (if there are any in your area or if you're willing to go somewhere else for the summer). Otherwise, there are "job postings" on publisher sites and they specific what they're looking for and what qualifications you need to apply.