If we accept a basic premise that entrepreneurship is about:
Then step one is obviously pretty crucial. This shouldn't be hard, right? Problems abound in the world today. Of course, the problems that you have are not universal, but you're probably not the only person on the face of the earth having them. So if you come up with a solution to a problem you have, that solution might have business potential! This is an organic idea: a concept for a product or service that you yourself would be a user of. Lots of companies start like this:
A great way to start thinking about things that might make decent venture ideas is to keep a frustration journal. This is exactly what it sounds like. On your phone (or like, some paper if you're rolling analog style) keep track of everything throughout your day that makes you go "I wish this was different." You don't need solutions yet, you're just compiling a list of problems.
You read the title, though. You can solve problems that you don't have. (Although if you're young, it isn't recommended.) When you do that, it's an inorganic idea. Don't let the 'in-' prefix fool you, there's nothing bad about this approach. In fact, inorganic ideas have certain advantages, chief among them is that if you aren't too emotionally attached to your solution, you'll be more comfortable in the event that you need to change or even abandon the idea. And that's a good thing.
Regardless of whether your idea is organic or inorganic, understanding the distinction can help you figure out what direction to take your project, and focus you on what kind of customers you're looking to help. Because at the end of the day, a good product fills a need for your customers.