I was with some friends, they shut it off, but thankfully I downloaded and activated the Cloud before so, so how do I go about tracking it?
If the phone is off you can't track it. You need the phone on and connected to some type of data service to send you data on its location.
Google search for "Android Device Manager." You can send a location command so that when it is turned back on you can see it on a map. (Can't track it till then, but you might be able to see its last known location.)
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