Do you have a way with words? Do you enjoy writing and reading? If so, you should investigate the pleasure and earning potential that a good writer can enjoy. Natalie Walet is happy to provide some reasons for such a decision.
If you believe that it is either too hard or too late to take on a career in writing, just consider the fact that every great (and not so great!) writer started out life by not being a writer. They just learned that they loved the task of writing and found their own writing style that urged them forward into a career that gave them freedom of time and the chance to create stories, poems, or even informational books.
There is no absolutely certain way of becoming a successful writer other than the willingness to sit at your computer (or typewriter, if you like the old fashioned way) and to start writing. You can read dozens of books by writers that tell you the way that they like to write and what works best for them, but once you have read a half a dozen or so books about how to write, you will most likely discover that there is no proven formula for writing a book, besides actually sitting down and writing it.
Some writers consider it a job and sit down each day of the workweek for a full seven or eight hour session. Others write in fits and starts, and may produce hundreds of pages in short shrift and then let it lay for a few weeks or months before going back to the project. Some writers get inspiration from real life events and others make up their stories and poems purely from imagination.
It all comes down to making the effort to write. Even if you are not certain what you want to say, experiment and try a few things out. Just remember one thing that is indeed certain: if you never start writing, you will never be a writer!