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When I add a few lights, I generally just use existing circuits.

Come from an existing switch (if it has a neutral) or a receptical.
 

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If the cable is behind drywall or above the joists it's fine.

It only has to be protected in conduit if it is "subject to physical damage". This means different things to diifferent people. I don't run exposed cable but many areas allow it.
 
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