Try to not post the same question in 3 different places on the forum. In order to get help with your questions, read through the link that John Stoltzfus posted. If you follow those guidelines then you'll likely get responses.
From a school project perspective, it will be up to you and your teammates, if you have them, to determine what materials to use for your design and justify this choice. The design is fully up to you.
Gotham steel. That stuff that batman uses to make them fancy pans that don't stick.
the hard part is how are you going to clean this thing. The last thing that you want to have happen is to contaminate the food that you are now cooking with the stuff that you cooked last week...