You usually have to shake water out of the cubes every once in a while from all the spraying. I spray 3x a day if I can remember to do it.
Alternatively if you just go to a hydro store and buy some wilt spray you can get away with never misting them.
The humidity should be near 100% the first 5 days, with pretty minimal light. And then after that you can take the dome off and give a little more light up until about day 14 or however long your method takes. Some clones will root in 7 days, others can take 14 or more if they're difficult.