Short answers, pulled from the story.
Leopold Mozart wrote Versuch einer gründlichen Violinschule, which was published in 1756. He composed the text during 1755, when he was thirty-six years old, and arranged for Johann Jakob Lotter of Augsburg to print it.
Beyond two further German editions in 1769 and 1787, the Violinschule was translated into Dutch in 1766 and into French in 1770.
Leopold Mozart was a court musician serving the Prince-Archbishop of Salzburg. He began with an unpaid post in the violin section and rose through the court musical establishment, though he was never promoted to the top position of Kapellmeister.
Leopold Mozart taught both of his children exclusively himself: Maria Anna Mozart, known as Nannerl, and Wolfgang Amadeus Mozart. Scholars cite both children's extraordinary musicianship as indirect evidence of Leopold's skill as a teacher.
Leopold Mozart argued that a performer must attend to the Affekt, meaning the emotion intended by the composer, in order to choose the most appropriate bowing. He believed a broad education including literature and poetry was necessary for a violinist to read those emotional clues in a score.
Leopold managed distribution himself, shipping copies to booksellers and collecting a share of the proceeds from sales. A letter dated the 7th of January 1770 to his wife Anna Maria instructs her to send twelve copies to Joseph Wolf's bookshop in Insprugg, selling each at two florins and fourteen kreutzers in Tyrolean coinage while reimbursing Leopold at one florin and forty-five kreutzers per copy sold.