 My final suggestion to test an idea is to make sure you can answer every single potential question about the idea. The who, where, when, why, and what for marketing, finance, operations, logistics, HR. How are you going to sell it? How are you going to get it to the store? How much does it cost to get it to the store? How much is the marketing? How much does marketing cost if one other factor changes? Answer every single question and your idea is a good one.