Step 1, Please pick one of two options

You can make an idea, or you can make a business conept. If you generate an idea, you need to find it is suitable for business, and how to start it, later.
This practice will take a while. Please have a pencil and paper ready. At anytime if you can not continue, you have to turn back

Good ideas would naturally come when you are walking in a market and observing. The trick is to leve your desk.