You will get hundred of suggestions for humidity etc. This is my opinion on the matter, even though im sure many diff. humidities will work well. I usually stay between 45%-50% the first 18 days. The last three days I stay between 65%-70%. This works well for me. Your bator should have water trays. The directions usually say fill one tray the first 18 days and 2 trays the last three days. But if its a home made bator, use a sponge and a pie pan thingy.