Let me tell you what you need to do. Let me give you the magic pill if you will.
Take Action. While staying calm sounds good, people are usually just suppressing their anxiety and not wanting to face reality. You have to test. Take massive action. Realize that you are worried and worried for a reason, but don't panic. Always test to make sure the market is interested, needs, or wants in your product before developing it. Do not try to create a need, try to create a product where there is already a hunger for the product with little competition.
Best of Luck,
Michael T. Irvin
michaelirvin.net
My books are available exclusively through Amazon Books. Check out my book "Copywriting Blackbook of Secrets"
Copywriting, Startups, Internet Entrepreneur, Online Marketing, Making Money