There's no stupid question here--trust me, we all have questions!
You don't need any type of cover for them, but as the other said, make sure you only have your lamp in one area of the brooder, so if they get too hot, they can move away. I do put a little washcloth or piece of material under the area of the heatlamp, so they have something to snuggle on. Also, don't put down newspaper as they can slip and get spraddle leg. Also don't put down chips because they like to eat things off the floor and can mistake a piece of chip for food and inhale it. I had both happen, that's why I know better! And the good people here at BYC gave me good advice!
Now I lay down a small towel or something like that for them to stand on and to gain traction. Just don't use anything you want to keep--they're quite messy!
Oh, one more thing about the heat lamp--keep the food and water out from under the heat lamp as it will spoil the food and make the water too warm.
Other than that, it sounds like your set!
Please don't hesitate to ask any more questions---all of us had to learn somehere!
God bless,
Tracey