It's not often that a new book by an author fifty years dead is published, but thanks to the diligent scholarship and dedicated passion of Andrew Lazo, we now have the opportunity to read the earliest draft of C.S. Lewis's autobiography. Early Prose Joy is included in Volume 30 of the literary journal SEVEN, together with Mr. Lazo's introductory essay.
Doug Jackson has just published a thoughtful review here http://awineskininthesmoke.blogspot.com/. I highly recommend that you read the review, then order your copy of this groundbreaking work from the Wade Center at Wheaton College http://www.wheaton.edu/wadecenter/Journal-VII/Contents.