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There are some great resources on how to set up and use OctoPrint. First of all, what is OctoPrint? Click here to learn all about OctoPrint from the official source.
To set it up with the Tevo Tornado is very similar to setting it up with any 3D printer.
This is a video that will help you get your OctoPrint setup, it covers all the basic configuration of the Raspberry Pi. Setup Video
Once you have it setup, OctoPrint will let you control your printer remotely. If you include a webcam you will be able remotely view the printer as it's working.