What I have been trying to share with you is just write. All the answers to your questions will be answered as you write.
Do doubt the first book you write will probably be a book you self-publish. There are lots of self-publishers out there. There are also lots of packages to choose from. Some you do a lot of the work and the publisher does very little. Other publishers do most of the work for you. Just ask lots of questions. Then ask them, "What questions should I be asking, that I don't even know to ask?" I found out there were lots of those. Pick a publisher you trust. Pick a publisher that someone you know has used, and they trust. Here is a link to the one I trust: http://www.wendykwalters.com/publishing.html
I have friends that encourage me. I have other friends that I ask to pray for me. I pray for myself. I pray for those that I write for. I literally ask God to help me write something that will not just bless people, but give them hope. I want to help build the people of God. I wanted to build mothers in my first book. I wanted to build marriages and give couples hope for a lasting marriage in my second book. In one of the books I am writing now, I want to open the eyes of God's people to see the enemies of God that are being unleashed and gaining power in these last days. The books that are not finished yet are still on my computer and in my heart. I talk to people about them. I am still asking questions.
There are a lot of people that know a whole lot more than I do about writing. The difference is, I am doing it. So just do it! When you need help, ask for it. Do all that you can do and God will bring people into your life to do what you can't. God won't do however, what you can do. So what are you waiting for?