[DrHank]

How much work are you looking for? Ideally, 2 coats of Kilz (or equivalent) oil based primer followed by a coat or two of white latex enamel. That way the stand will be protected from water spills. I put 2 pieces of firring strip about 1/3 of the way from each end of my sump to allow for air circulation.

Plastic rocks and synthetic corals should be ok to add whenever you like. Personally, I like mine completely covered by sand or rock to decrease visibility. In your case however, I can see that a tank half full of water with possibly sand on the bottom might be a tad boring.

You can put your sand in at any time. I usually add mine just before or after my rock goes in but I see no harm in putting it in now if you want to. Remember though that whenever you decide to add it, you need to have circulation going. Also if you completely fill your tank now remember that water will be displaced into your sump when you do add your rock.