Welcome to D.C.!
I am not familiar with that brand of cook stove. If you can find the model number, you will likely be able to download a user manual that may answer your questions. As for the pic you posted, the first ones look like the oven racks that come (or at least used to) with conventional ovens, usually made of steel. I am also sure that someone will be along with more information and help. Again, welcome to D.C.!
I used to be a racist, but I don't have much interest in it since Dale Earnhardt got killed.
Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read.
Good judgement comes from experience; experience comes from bad judgement.