I want to read the Lord of The Rings,  the epic high fantasy novel by Tolkien
I highly recommend it. You should also watch the movies
I believe it began as a sequel, which what book should I start reading? 
Start with first of the trilogy. I dont remember the exact name but it will give you a good background.
The Lord of the Rings
The Lord of the Rings is an epic high fantasy novel written by English author and scholar J. R. R. Tolkien. The story began as a sequel to Tolkien's 1937 fantasy novel "The Hobbit", but eventually developed into a much larger work. Written in stages between 1937 and 1949, "The Lord of the Rings" is one of the best-selling novels ever written, with over 150 million copies sold.
The title of the novel refers to the story's main antagonist
. (Hence the association of the Gamgees with the Cottons.) I knew nothing of its origin."
Tolkien claimed to be genuinely surprised when, in March 1956, he received a letter from one Sam Gamgee, who had heard that his name was in "The Lord of the Rings" but had not read the book. Tolkien replied on March 18:
"Dear Mr. Gamgee,
It was very kind of you to write. You can imagine my astonishment when I saw your signature! I can