Always send for a writer's guide and sample copy before submitting. Magazines are much easier to break into. In fact, I'd suggest you do not attempt a book until you've established a good publishing track record in magazines. If you want to make money, become a greeter at Wal-Mart rather than a writer. Fewer than 5 percent of writers actually make a living at it.
Writing offers great satisfaction, but little money.
Most of all, be persistent as well as patient. And be patient. Editors, unfortunately, are too busy to be able to tell you why they can't use your material, so don't ask. All rights reserved. Helpful clues for detecting scams in agenting and publishing.