Here is an example of what I used. A small grow dome for herb growing from Lowe's. Was like 99 cents. Soaked the rockwool in ph corrected water for 24 hours. Sprayed water in the bottom of the dome once a day to keep humidity high and kept them under some floros.

Then when they have roots poking out of the bottom of the rockwool put them in the DWC.

Sorry about the fuzzy pic.