Well, if your base rock is dry, then yes. If you're referring to base rock as in large pieces of LR
, then no.
Rinsing would be a good idea, it will cut down on the sandstorm significantly.
Good call on the lights, it would cut down on the cycling diatoms and not waste energy and bulb life for no reason. You can certainly put your skimmer on, if it's a new one it'd be a good idea to do so so it goes through the break-in period while you're cycling