I don't know how to cook broccoli with potatoes in the oven...?

So I cooked potatoes without the peel in a pan for about 8 minutes, then I cooked the broccoli. Later, I greased up a glass bowl, greased the potatoes and the broccoli up and then poured some cheese over it. Do I need to add water, or something? And how long should it stay in the oven at what temperature?