There are many, many ways to make money from writing. Working on staff at a paper or mag is one way, but many people prefer to work freelance, selling articles, columns and the like to papers, mags and websites. That way you can pretty much come up with your own ideas and write about what you're interested in, but you'll have do all the legwork and research, and be a pretty smart operator when it comes to contracts and legal issues.
There are also many specialised fields: academic writing, technical writing, educational writing, copywriting, scriptwriting... just to name a few. And within each one of these categories there are a raft of specialised knowledge areas.
Try doing some research on the subject - there should be books on the subject of writing at your local library, or else go nuts with Google (but watch out for writing scams)!
The best resources will be country-specific, since the marketplace and legalities differ from place to place.