Example ~/.emacs setup of org-tree-slide together with elpa-darkroom:

(require 'darkroom)
(when (require 'org-tree-slide nil t)
  (define-key org-mode-map (kbd "<f8>") 'org-tree-slide-mode)
  (define-key org-mode-map (kbd "S-<f8>") 'org-tree-slide-skip-done-toggle)
  (define-key org-tree-slide-mode-map (kbd "<f9>")
    'org-tree-slide-move-previous-tree)
  (define-key org-tree-slide-mode-map (kbd "<f10>") 'org-tree-slide-move-next-tree)
  (define-key org-tree-slide-mode-map (kbd "<f11>") 'org-tree-slide-content)
  (add-hook 'org-tree-slide-play-hook (lambda ()
                                        (make-local-variable 'display-line-numbers)
                                        (setq display-line-numbers nil)
                                        (darkroom-mode 1)
                                        (menu-bar-mode -1)
                                        (toggle-frame-fullscreen)
                                        (toggle-scroll-bar -1)
                                        (visual-line-mode 1)))
  (add-hook 'org-tree-slide-stop-hook (lambda ()
                                        (make-local-variable 'display-line-numbers)
                                        (setq display-line-numbers t)
                                        (darkroom-mode -1)
                                        (menu-bar-mode 1)
                                        (toggle-frame-fullscreen)
                                        (toggle-scroll-bar 1)
                                        (visual-line-mode -1)))
  (org-tree-slide-presentation-profile))

Hope that helps to get started!
