Structure develop

From an idea to the appearance design , it’s the first step of creation, and also the first step of  products development , so what’s the next step ? do the mass production ? do a 3D print sample ? 

Not that rush, one the most importance step for products development and prototyping is the structure develop or design, for the structure design , we can know how to save the assemble time,we can make sure how many parts the products needs for produce it , with the structure design we also will know about how will the molding cost , how’s the electronic components will arrange inside the products .