urgent help please!! (duck eggs)

Ok so my young broody hen decided to stop sitting on her eggs, so I had to take action and my only option was to make a homemade incubator. I watched a couple YouTube videos on how to make one and kinda did my version of it. So my thing is, am I right when I say they need to be at 37-38 degrees celcius and at 55% humidity?? Do I need to spray water on the eggs a few times a day?? How many hrs do I need to wait in between turning?? Anything I'm missing?? Total newbie so all advice is appretiated!!! Thanks!