I have several books sketched out in my little thought notebook, but I also have one that is 90% completed. This book is written with the chapters based around a gospel topic. I use my life's experiences in [a specific activity] with doctrine to help teach about the principle. I have had a few friends who are editors look through it, but would love to have some other people read it who are not friends or family. Do you have any suggestions? Everyone who has read through it has loved it and been touched by it, but I'd like to look at the practical side of things before submitting it for publication.
Again, writers groups are a place to start with readers.
As for the practical side of submitting and publishing, go to your library. You'll find a whole shelf of books that talk about the ins and outs of submission. I recommend starting with the current Writers Market. It will give you some basic how-tos.
After that, there are 3,452 books and counting on the practical side of getting published.
And also these posts.