You should be able to build the smallest piece of your idea to test your market. Say your idea is to build a device that can boil the ocean. Can you build a pro

You should be able to build the smallest piece of your idea to test your market. Say your idea is to build a device that can boil the ocean. Can you build a prototype that can boil a cup of water? Build that first and see if there are any buyers. You want to validate that there is a market out there willing to pay money to solve the problem that your idea solves, and then worry about getting money to scale it.