When you have an idea for a venture, you should postpone talking to prospective users or customers for as long as possible, for they could stifle your creative process.
When you have an idea for a venture, the very first thing you generally want to do is build the product and start testing it with prospective users. This is better than interviewing and learning about the users first, because without seeing the product, the users would not offer valuable feedback anyway.
As an innovator, always distrust customer feedback. No one can predict the future. Prospective customers are not the best people to tell you what product they'll like from you in the future.