Please, please don't. That way lies severe and utter disappointment. The first 3 books are very good, the 4th has it's moments and the 5th on are King at his meandering, self-indulgent worst. They shit all over the promise from the early part of the series.
How many books are there in the series?
The Dark Tower: The Gunslinger (1982)
The Dark Tower II: The Drawing of the Three (1987)
The Dark Tower III: The Waste Lands (1991)
The Dark Tower IV: Wizard and Glass (1997)—Locus Award nominee, 1998[3]
The Dark Tower V: Wolves of the Calla (2003)—Locus Award nominee, 2004[4]
The Dark Tower VI: Song of Susannah (2004)—Locus Award nominee, 2005[5]
The Dark Tower VII: The Dark Tower (2004)—British Fantasy Award winner, 2005[5]
The Dark Tower: The Wind Through the Keyhole (2012)
Finished up The Drawing of Three. Enjoyable although I forgot about how bad Stephen King is at doing ethnic dialogue. Some of the Odetta/Detta dialogue is just cringworthy. The audio book reader doesn't help it either.