I've written 7 nonfiction books, 2 of them textbooks.
Last year, I took two advanced creative writing classes with Jim Krusoe -- I learned a lot and wondered why I hadn't started writing fiction long ago. Better late.
Now I'm writing my first novel. Whoop-de-doo, no? I'm excited but a little lost. I have a completely planned story (not a pantser, except for scenes and sentences!). I'm flexible, it might change. But so many things I don't know. Last month, I learned about interior dialogue. Of course, I recognized it right away, but didn't have a word for that concept, so I couldn't use it as a tool of choice -- made things much easier, though.