For org-mode, the documentation on their site is good, but I also found myself referencing this [0] site a lot. The author happened to do a lot of things in ways I liked, or near enough that I could borrow their config and tune it to my own preferences. Borrowed piecemeal, not wholesale. I recommend starting with stock org-mode and emacs and only adding pieces as you understand them. Otherwise you end up with a non-stock configuration and other people may not be able to help you out as readily because you can't identify whether erroneous behavior is emacs or your specific configuration.
I know a lot of folks really like spacemacs — I'm not a fan of the vi keybindings, or of its version of emacs-style keybindings, but regardless it's a really well-made emacs starter kit.
I'm too heavily invested in org-mode to switch to this, but it does seem like the best fit for this sort of service.