As a small child I would send myself into a semi-trance and tell myself stories. I can still do that, but unfortunately you can't write in a semi-trance, and thinking up stories when you're fully conscious is much harder.
I write novels for middle readers, and write and illustrate picture books for younger children.
My first novel, 'Midsummer Legend', was self-published in 2005. This is a plausible fantasy equally popular with adults and children of about ten upwards.