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After several hours of scouring the net for a half-comprehensive and up to date tutorial on Planetary Interaction, and failing miserably to find anything, I decided to just jump in and figure it out on my own.
Granted, I've only spent a handful of hours so far messing with it, I've barely begun to scratch the surface of this new feature in the game. I decided to make a recording of the most basic element of setting up a command center, extractors and a processor. Enough to get you started.
I apologize if I've missed anything, but like I said, I am just starting to learn like everyone else. :)