One book that tells Gandalf's story is 'The Hobbit'. It provides some background and initial encounters with Gandalf. Additionally, the expanded universe of Tolkien's works like 'Unfinished Tales' also offer more insights into his character and exploits.
The Lord of the Rings series by J.R.R. Tolkien features Gandalf and his adventures extensively.
The book 'The Silmarillion' by Tolkien has elements related to Gandalf's origin and the broader context of the world in which he exists. But for a more focused account of his specific story, 'The Lord of the Rings' is the main source.
You could try 'The Silmarillion'. It provides background and additional context related to Gandalf and the broader Tolkien universe.
Gandalf originated from a higher spiritual plane. He was dispatched to Middle-earth with a purpose. His background involves being part of a divine order and having a responsibility to bring hope and resistance against evil.
Well, perhaps Bilbo is fed up with Gandalf constantly pulling him into dangerous adventures. Maybe Gandalf made a decision without consulting Bilbo first, like bringing the dwarves to Bilbo's house unannounced. So Bilbo decides to tell Gandalf off for not respecting his privacy and putting his life in jeopardy so often.
Gandalf is a Maia. He was sent to Middle - earth by the Valar. He was one of the Istari, a group of wizards. His purpose was to guide and oppose the rising power of Sauron.
The target audience could be fans of 'The Hobbit' and 'The Lord of the Rings' who like to see different character dynamics. People who enjoy seeing the more feisty side of Bilbo might be interested.
Maybe he wants to pass on knowledge or history. Gandalf is full of wisdom and stories are a great way to share it.
I'm not sure which specific story Gandalf is telling as there are many in the Tolkien's works. Maybe it's about the history of Middle - earth, like the battles against the dark forces or the tales of the rings.
His being a Maia and sent by the Valar.
The fact that Gandalf is from the Ainur is a very important part of his origin story. Also, his transformation into the form of an old man is significant. It allowed him to interact more easily with the races of Middle - earth, like humans, dwarves, and elves. And of course, his being sent to oppose Sauron is a central aspect of his origin. It shaped his entire journey in Middle - earth.
Well, first off, Gandalf being a Maiar is a huge part of his origin. It gives him his power and wisdom. Then, the fact that he was sent to Middle - earth by the Valar is also crucial. This mission from the Valar shaped his role in Middle - earth. He was part of a group of Istari, and this also stems from his origin story as he was chosen for this role because of his nature as a Maiar.