The beginning for a writer is the journal. I say this because it is the testing grounds for all your styles and ideas. If you do not keep a journal, it will be hard for you to be a good writer in almost any field.
You should write a little every day if you want to cultivate your literary skills. That's the beauty of a journal... because you don't need a revolutionary idea or original thought to write a successful entry into your journal. Other types of writing are not as forgiving; when you write poetry when you don't feel poetic or a story when you don't feel inspired, you will likely not turn out highly artistic words.
An essay noting the state of the civil rights movement in the wake of Rosa Park's death.