Im doing my first dwc hydro grow as well, in a Stainless steel welded box I made that holds about 8 and a half gallons of water, 4" net pot, rockwool starter medium. Have had a sprout in rockwool for 9 days now, its growing well, my first fill of water I put a 1/4 dose of the seedlings feed schedule, fox farms nutes.
Will be tagging along with you here @shady424 since im new at this too!
Heres a link to my hydro go…