First time doing an open bake

So I’m going to attempt an open bake for the first time, however, I don’t have a stone or anything like that. I was going to use a cookie sheet? Thought? I was also going to try the ice cube method for steam. Thoughts on that? I’ve mastered my bread in a DO and am wanting to possible start making my loaves in bulk to sell and obviously I can’t really do that in a home oven and a DO. Thanks!