According to Statista, the internet has approximately 3.17 billion users, of which 2.3 billion people are active on social media as of July 2015. So, here's the fact. Your current and prospective customers are online, so are your competitors. That adds up to a lot of users generating and consuming content.
Today, there are more mobile devices than there are people in the world. That means there's ample opportunity for you to grab a slice of the growing market for mobile device accessories. Phone cases, in particular, are easy to source and appeal to people who are looking to inject some individuality or extra functionality into the one device they can't live without.
Starting a business is risky and takes every bit of dedication and hard work a person can employ to their follow-through-and-hang-on genes. But, it's one of the most rewarding experiences that you'll ever have in your life.
There are plenty of ways to earn money online, but if you have a website with a large audience, you've already won half the battle. However, monetizing a website is not the same as monetizing an audience.