I'm happy to announce that I was able to buy a free ebook at Amazon entitled Enter to Worship - Exit to Serve by Ronald K. Gray. You might want to check this ebook and maybe it will still be free by the time you read this post.
I love checking on free Christian ebooks from time to time. I actually have a number of ebooks in my Kindle now. I've downloaded all of these for free. It has become so many that I sometimes get confused and overwhelmed as to which book I should read first.