First time

So first time growing and I think I have been doing pretty well, water cup to germinate then to silo cups good roots to 3 maybe 4 gallon bags. Don’t want them to get to big tent is a 2 by 2 so thinking about flowering next month, but worried about feeding and dont know which route to go or even how to feed lol want organic but trying to get the best buds iFox farm ocean forest when transplanted to bags need sone insight and a little advice if i can get it. Thanks