Hello, I will make the cake myself for my son's birthday for his friends at the nursery. But it will be my first experience, I have never made a birthday cake before. I will be making a cake for an average of 25-30 people including teachers. I'm thinking of a two-layer cake, a square one seemed more logical to me, frankly, I think it would be easier to have a square shape than a round one. What size product would be useful for me? Or you can give another mind, of course, mind is superior to mind.