TMusic:

How often should I water/spray/both?
You don't want the RR sitting in water. They should be somewhere between moist and wet. When you put water in the tray, try to make the amount just right so that the RR soak up the maximum they can hold, but no more. Keep the dome on at all times, except a couple times a day take it off and blow some lung air into the plants and dome. That's usually all I have to do as far as moisture. If you see them wilting you can give them a couple spritzes of water, or use some anti-wilt, though I've never needed it. After they get 2 or 3" of roots, start hardening. Crack the dome with a pencil or something and see if they can take it. Keep increasing the open space under the dome until they can handle it with the dome completley off. Watch for signs of mold or rot, especially where yellow or brown leaves touch the plastic. If any, pick it off and use a little less water. Also spray with an antifungal. No nutes except a small amount of B1 to promote root growth.

Once they're rooted, can I put them right into 12/12 or should I leave them under the cfl for a week or two?
You can flower immeadiatly and many people do. Depends on your space and your needs. I like to let mine veg about 2 months, then flower. The longer you veg, the more weed. Remember plants will increase in size by 2 or 3 times once flowering is induced, so plan accordingly. If you decide to veg awhile, consider throwing a couple more lights on them. More light = more growth = more weed.