Where does your Startup ideas come from? Where did it started? How did it came into your mind? And most important question how will you be able to execute and push through with your startup?
Well I believe your startup ideas come from your own itch, it's something that we don't have right now (it's hard to think of something that does not exist in this world right now). It's an innovation that would help people in their daily tasks for example in groceries and department stores whenever you buy something cashier tellers use Point of Sale systems that would make their lives easier instead of writting down every single item that you customer purchase. That's innovation, you just really need to think deep of things that doesn't exist and things that would help people in their daily tasks.
If you already have your startup ideas and you really want to push through with it , first step is to plan everything like how will you do it? how will your startup help people? how are you going to attract users to your application/service? How will this startup earn money? List everything first and then know what to prioritize and from there you know when and how to execute it.
Here's my tip: Always bring a small notebook and pen or smartphone, to list down every idea that you have in mind and then decide later on