My answer to How do I start small business in mobile industry?
Answer by Ken Larson:
Give your start up idea the following test:
1. Do you have a product or service niche in mind?
2. Do you believe you have a market for 1 above and the means to reach it?
3. Are you willing to develop a business plan using the tool kit linked below to validate 1 and 2 above before you launch?
If the answer to the above questions is yes than take the actions indicated, observe the results, then make an informed decision on whether or not to proceed.