Why test your market? and Why others Fail?
Here are the quick steps to test your market.
Step 1: Use Clickbak Marketplace to verify that the market is buying
Step 2: Choose some products to promote as an affiliate o a small scale. (To verify that the market is responsive in general)
Step 3: Your test results are good, build your own product.
Watch this video of Frank Ker go through the details of how to do it.