It's not a hierarchical movement, and there is no "grand poobah." it is a very open movement that stresses self-discovery of the Divine. I'm not sure what you mean by a "playbook." We walk our individual paths together.
It's not about hierarchies or playbooks. It's about doing the work individually in one's own consciousness to become a fuller revealer of Divine Truth.
Who's the leader and what's their bible?
This sounds like the last question rephrased. There is no "leader." it's a very open, decentralized movement. Each o the New Thought denominations has its own particular ledership cadre, but they are chosen by representatives of the membership. What it the New Thought bible? The movement is Western and Christain based, so extensive use is made of the Christian Bible. However, it is not exclusive. All of the religious wisdom of the world comes together in New Thought. Dr. Ernest Holmes, the founder of one of the New Thought denominations, Religious Scinece (Science of Mind), called it "an unusually persistent attempt to think correctly." He also told us that thought produces material conditions. That is an essential New Thought principle.
In other words, there's absolutely no reason to listen to them.
...into the gas chambers of Auschwitz. 1945 was when much of the world soured on the progressivistic idea of human history. Sad to see it's back again.