If I use a shield for this, how to product my prototype if I want to create a business with it ? smiley-money Can we convert a shield in production ?
Yes, you can convert a shield's hardware into your own PCB layout but if you have to ask that question, it's probably not you who will do that for the production version.
I would first make your project work and when it does, begin thinking about you might make a product of it.