Opinions expressed by Entrepreneur contributors are their own. Working on a new product is always an exciting and risky process, even when you have all the data suggesting that the product is a win.

If you're building a product for your new business, you'll first need a solid prototype. This will help you better visualize your concept and start getting necessary feedback from customers or peers.

Opinions expressed by Entrepreneur contributors are their own. Amazon Fire Phone, Google Glass, New Coke and Nintendo’s Virtual Boy: What do all these products have in common? They didn’t sell.