You don’t have to work in a cubicle to perform business writing duties. Freelancers engage in commissioned business writing all the time. In fact, the more business-oriented the writing job, the bigger the money you can usually make.
What kinds of business writing opportunities can a freelancer expect?
Company web sites. Those web sites need content and they usually look to outside help for that. If you can supplement your writing with basic web skills (e.g. using WordPress or Joomla, some PHP), you might find even more opportunities.
Newsletters. Almost every business of a moderate size will have an internal newsletter. Those who deal directly with end-consumers might even have subscription newsletters for their customers. While some companies will employ a full-time writer for that, many do rely on freelancers for the job.
Marketing materials. Brochures, flyers and other marketing materials need to be written by someone. Oftentimes, it’s done by someone outside the organization, unless the business revolves around writing those marketing materials themselves.
Internal documents. Many companies are in need of people who can sort out, update and otherwise improve their internal documents, such as employee manuals and training guides. Whenever you meet with any business for potential opportunities, always bring this up — these documents often get put in the backburner until somebody reminds them.