Build this simple prototype for any start-up idea you may have.
Create a landing page explaining in a very simple way the following: the problem your idea solves, how your product works, and specifically it will benefit the customers
Then create an email capture form to elicit customer commitment to the idea by asking for their email and promising to update them once the full product becomes available.
Tell them they’ll get special deals and discounts as your first customers. This should increase the conversion rate of the form.