Generally speaking, if it sounds OK it's more than likely you're following "the rules" even if you don't know you are.
So know the rules, and you'll sound OK no matter what. Then you'll know when to break them, too.
-I chord can change to any chord
-II chord can change to any chord except the I chord
-III chord can change to any chord except the I or the VII chords
-IV chord can change to any chord
-V chord can change to any chord except the II chord or the VII chord
-VI chord can change to any chord except the I or the VII chords
-VII chord can change to any chord except the II or IV
Someday we'll win this thing...
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