One thing I want you to get from the book is to share your startup idea with as many people as possible. Most talk to 1 or 2 close professional friends who decide to support you not the idea. Find at least 5 or preferably 10 targeted people and buy them a coffee or beer and tell them your idea. Listen to what they ask and what they comment on. They are your first customers.
This and many other simple lessons are available in my book Build The Fort and available over at Amazon.com in both Kindle and Print versions.