I thought of this the other day when I recalled writing a specific situation, and then I couldn't remember which of my books had that scene in it. All my titles repeated in my head, one after the other, and it came to me that in some ways, they are my children.
About 25 years ago, I started writing seriously. Before that, I had dabbled in writing. I had started a book, which I later called Child of the Sand (still not published) but I hadn't finished it. Then somehow the beginning scene for The Sixth Discipline popped into my head. A man with a bow and arrow was walking through a forest. He had a premonition of danger and then he was shot (not fatally) and kidnapped. That was it, to start with. I sat down and started writing (I have never been an outliner; I am a classic pantser) and six week later I had a first draft. In actual fact, that first draft became two books, since it was too long for one. The working title had been Haven but that became the series name for the two-book series, The Sixth Discipline and No Safe Haven. It was the fastest I ever wrote a first draft.
But in the way of things, both books sat there and germinated a while. I always wrote whatever floated to the top of my brain, to take advantage of the energy that a story has when it's newly formed. I had a day job, a helpful husband and two wonderful kids, but I always made time to write in the evenings. I eventually joined a writers' critique group, and I took a writing class, both of which I found helpful. But in writing, I have found nothing more helpful than the actual doing of it. Getting feedback is 100% essential, but it's not how you start. You start by doing it.
And if you're lucky, you give birth to one or more stories.