A beginning writer must follow the path that feels most comfortable. For most people learning to write, that path is nonfiction. It enables them to write about what they know or can observe or can find out.
If you have not been keeping a journal or diary, it is time to start one--or a couple of them. There is a personal journal where you write your innermost feelings about life, often in a spirited, free-writing, spontaneous fashion. Then there is a writer's journal, where you record your thoughts and ideas about your writing work. In a writer's journal you conduct an ongoing, spontaneous dialogue with yourself about writing, developing the subjects and ideas you intend to or are actually writing about. It is where the masterpiece begins.
Any person who can speak English grammatically can learn to write nonfiction. Nonfiction writing is not difficult, though it is a technical skill. What you need for nonfiction writing is what you need for life in general: an orderly method of thinking. Writing is literally only the skill of putting down on paper a clear thought, in clear terms. Everything else, such as drama and "jazziness," is merely the trimmings. I once said that the three most important elements of fiction are plot, plot, and plot. The equivalent in nonfiction is: clarity, clarity, and clarity.