Before venturing into writing business, you must know its nature. Writers and editors produce enormous amount of written material to be delivered to a target audience. They spin content using a number of multimedia formats for readers, listeners or viewers.
To start this business, you need a computer or a laptop, an Internet connection and a voice recorder. Besides you need some reference books. Having secured these basic tools, select a place at your house from where to work. The place you pick up must be enough to accommodate your computer, reference books and files. Be sure the workplace is quiet and away from the din of your family, so that you can work without any disturbance.
Having done this, buy books and magazines with useful tips to sell off your stuff.
After the initial setting, you try to know the ropes of the trade. You must learn about a query letter. You must understand its components and fundamentals. A query letter is a brief one page one used as a tool to hook an editor of a magazine and get him interested in what you intend to write for them.
Always be professional. Acquaint yourself with writer's guidelines of the company of your interest. Internet with plenty of information can be your source.
Make your business legal. Consult IRS State By State and fill all the forms to get a personal ID number so that you can pay taxes.