who are the other characters in the first novel by the author previously mentioned?
Dark Lord Sauron, Frodo, Sam, Merry and Pippin.
The Lord of the Rings

The title names the story's main antagonist, the Dark Lord Sauron, who had in an earlier age created the One Ring to rule the other Rings of Power as the ultimate weapon in his campaign to conquer and rule all of Middle-earth. From homely beginnings in the Shire, a hobbit land reminiscent of the English countryside, the story ranges across Middle-earth, following the quest mainly through the eyes of the hobbits Frodo, Sam, Merry and Pippin.
how old was bilbo when he found the ring 60 years old. does he appear in any fictional work? The title character and protagonist of J. R. R. Tolkien's 1937 novel "The Hobbit", a supporting character in "The Lord of the Rings", and the fictional narrator of all Tolkien's Middle-earth writings. what is his role in these stories? Was a hobbit . who is the novelist mentioned here? English writer, poet, philologist, and academic. who are some of his ancestors? Michel Tolkien, Christianus Tolkien, Daniel Gottlieb Tolkien,  Benjamin Tolkien. did he fight in any war? No, He was a temporary second lieutenant any other titles written by him? "The Book of Lost Tales", the tale of Beren and Lúthien, "The Lays of Beleriand". what is the first one about? It is a collection of early stories by writer, which were complex fictional myths. when was it published? In 1984.
wiki:19676127
The Lord of the Rings [SEP] Introduction
From homely beginnings in the Shire, a hobbit land reminiscent of the English countryside, the story ranges across Middle-earth, following the quest mainly through the eyes of the hobbits Frodo, Sam, Merry and Pippin. Although generally known to readers as a trilogy, the work was initially intended by Tolkien to be one volume of a two-volume set along with "The Silmarillion", but this idea was dismissed by his publisher. For economic reasons, "The Lord of the Rings" was published in three volumes over the course of a year from 29 July 1954 to 20 October 1955. The three volumes were titled "The Fellowship of the Ring", "The Two Towers" and "The Return of the King".