Welcome to 3REEF!
Some people run there lights for as little as 5 hours a day some 12-14 hrs a day. you can run your lights together some people turn on the actinic first then a while later the add the 10000k then reverse this at the end of the day to simulate sunrise/ sunset. I am assuming that you are using power compacts. when I used them the cycle ran about 10 hours with the 1000k runing about 8 hours.
You can use a siphon to clean sand when you do a water change but how often you clean your sand depends on what kind of sand bed you are going for (how deep is your sand bed?) look at the articles about sand for more info.
You can add live rock when ever you want you should monitor your levels to tell when the tank has cycled however I would not add a large amount of uncured live rock once you have livestock in your tank.
If you add information about your tank in your signature people will be able to be of more help, You can find this under user cp
I would not add coral until you see Coraline algae start to grow on plastic.
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100 gal touch tank for propagation;Current Sunpod2 HQI @1400k HQI ,38 gal Korrall sump, ASM G-3 skimmer, Mag 9.5. Stock changes often
125 gal ;Aqualight Pro HQI 2 HQI@1400k / Compact Fluorescent/Lunar Light Fixture, 5 powerheads, 30 gal sump, mag 12(return),Ocean runner 3500(return through chiller), ASM G-3 skimmer, UV sterilizer, Artic chiller Tobacco bass, maroon clowns, Seriatopora guttatus, Seriatopora hystrix, capricornis, Acropora, Spongodes, porites, Turbinaria,Stylophora pistillata, etc
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