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It is the Weasley Wizard Wheezes - Fred and Georges Joke shop!
Weasley: Because it was made by the Weasleys Wizard: Because they were wizards and the items in their shop were magical Wheezes: Some things made you laugh or sneeze uncontrollably
Arnold is Ginny Weasley's purple Pygmy Puff. Arnold was purchased from Ginny's brothers Fred and George Weasley at their shop, Weasley's Wizard Wheezes. Arnold's fate after the Battle of Hogwarts is unknown.
No, he briefly worked for them helping Harry Potter track down and capture escaped death eaters but Ron then left the department to help run Weasley's Wizard Wheezes.
You go to Diagon Alley, to Eops Owl Emporium, located right beside Weasley's Wizard Wheezes. You can buy the characters there.
Weasleys' Wizard Wheezes is introduced in Harry Potter and the Half-Blood Prince (Book 6).
Ginny Weasley has a pet from Weasley's Wizard Wheezes, her brothers's, Fred and George, joke shop. I believe it is called a Pigmy Puff, named Arnold. You may find this in book 6 of the series, Harry Potter and the Half-Blood Prince.
Ron marries Hermione and together they have two children Hugo and Rose. He also worked as an Auror alongside Harry for a number of years and helped George run Weasley's Wizard Wheezes.
He went into Borgin and Burkes to get the Vanishing Cabinet fixed.
An assortment of things, such as puking pastels, nosebleed nougat, and such other weasley wizarding wheezes.
Weasleys' wizard wheezes sells Peruvian Instant Darkness powder
It's an alternate track for the scene in Weasleys' Wizard Wheezes, i.e. it was composed for that scene, but they didn't use it in the end.