After the BIBLE (of course) I have read one by Charles Stanley way back in the 90's but nothing since coming back to Jesus. Looking on Amazon and one Christian book review site, I found few titles.
The one that kept coming up the most was "How to be Filled with the Holy Spirit" by A.W. Tozer written around 1960. I was skeptical going back that far, during such tumultuous social changes what I would end up with. But it came up again and again, and was relatively cheap to buy.
So far, I have the book by Tozer and "The God I Never Knew" by Robert Morris.
Tozer's book is only 30 pages. It's blunt, simple, and biblical. I still haven't gotten through it despite it's easy facade. Now I know why so many people like it.
Morris's book looks really good. I'm not far into it either, yet. It has a study guide included in the back that recommends taking your time here also. I am going to follow that and try not to skip ahead. His writing style is clear and easily readable. And his ideas on friendship with the Holy Spirit are exactly the kind of guidance I was looking for.