Create a Portfolio - If you are planning to start as a writer with no formal background, then the best way to do it is to create a portfolio by include samples of all your writing no matter how insignificant they might be. They could be published in school or college magazine. It could also be a letter written to the editor of a newspaper.
Research and Read - Read a lot to know about the latest styles of writing. One of the best ways to be a better writer is to read and research a lot. You can read anything that interests you which will also help to increase your vocabulary.
Take lessons on creative writing and technical writing - Well, it is true that nobody can teach you how to write. But technical writing and creative writing courses will only help you brush up your skills and refine your style. Learn to write for the online medium as this is where the future lies.
Start a blog - You can always draw attention of publishers by starting a blog of your own and be an active participant in the social media. Connect with other writers to build your network.
Pursue Higher Education - It is always good to pursue high education to widen your horizon and interact with more like-minded people.If you do not do too well financially as an independent writer, you can always join as a content or a technical writer in some reputed organisation.
Click on the list of careers under Liberal Arts and Humanities