If you have a brand new Raspberry Pi* and want to set up Octoprint, I’d recommend starting with Thomas Sanladerer’s video, it covers everything you need to get Octoprint up and running. The rest of this covers additional configuration to Octoprint after it has been set up. The case in this picture can be found on Thingiverse.
These are a few notes on smoothieboard configuration for my Eustathios Printer. Keep in mind the date of this post as much of this will be out of date soon – things are changing quickly with the smoothie firmware and new improvements are added regularly. I may come back and update this as things change.