Roger M. wrote:You missed the word "some" in my post Chris, additional research will demonstrate that nearly half the authors on my list wrote only the book I noted ... and nothing else.
Below is the evidence that ALL not some had substantial writing experience BEFORE they had their 'one hit' wonder. I am copying snippets from Wikipedia. You can read their entire bio to find out the details
Roger M. wrote:Emily Bronte wrote only one book in her life - "Wuthering Heights"
Emily and her siblings had access to a wide range of published material; favourites included Sir Walter Scott, Byron, Shelley, and Blackwood's Magazine. ... In their leisure time the children began to write fiction at home. [Note: Poetry, diary papers, and a novel predate the 'debut' work.]
Roger M. wrote:Anna Sewell only wrote one book in her life - "Black Beauty"
The daughter of a successful children’s book writer, she helped edit her mother’s manuscripts from an early age but was not published herself until she was 57. ... Her mother expressed her religious faith most noticeably by authoring a series of evangelical children's books, which Sewell helped to edit,...
Roger M. wrote:Margret Mitchell only wrote one book in her life - "Gone with the Wind"
... a collection of Mitchell's girlhood writings and a novella she wrote as a teenager, Lost Laysen, ... Reporter for The Atlanta Journal ...
Roger M. wrote:Boris Pasternak only wrote one book in his life - "Doctor Zhivago"
Pasternak's first book of poems, My Sister, Life (1917), is one of the most influential collections ever published in the Russian language. Pasternak's translations of stage plays by Goethe, Schiller, Calderón de la Barca and Shakespeare remain very popular with Russian audiences. ... Following My Sister, Life, Pasternak produced some hermetic pieces of uneven quality, including his masterpiece, the lyric cycle Rupture (1921).
Roger M. wrote:Sylvia Plath only wrote one book in her life - "The Bell Jar"
At age 11, Plath began keeping a journal. ... in the evening sat in on creative writing seminars given by poet Robert Lowell ... Plath published her first collection of poetry, The Colossus.
Roger M. wrote:J.D. Sallinger only wrote one book in his life - "The Catcher in the Rye"
Salinger was raised in Manhattan and began writing short stories while in secondary school. Several were published in Story magazine in the early 1940s before he began serving in World War II. In 1948, his critically acclaimed story "A Perfect Day for Bananafish" appeared in The New Yorker magazine, which became home to much of his later work.
Roger M. wrote:Oscar Wilde only wrote one book in his life - "Dorian Gray"
After writing in different forms throughout the 1880s, he became one of London's most popular playwrights in the early 1890s.
As you can see, and as anybody can verify themselves, none of your examples are true. They all had substantial writing experience of one kind or another before they wrote the one book that got published.