Right off the bat I'll give you some ideas on how people make money on the internet.
1) Selling Physical Products or a Service
Selling physical products takes upfront investment, since you will need to buy the product upfront. But if you have a good product, that is cheaper than competitors, or better you will do good. The great thing about this is that your website needs very little maintenance. But I recommend that you chose something that you know about. It is easier to sell something you know about.
2) Sell other peoples products
This way you will earn a commission every time someone buys through your link. But this also you have to present it in a unique way. You have to provide some sort of value to the person you are referring. You have to build some trust. This is why it's important to promote things you believe in, and you know about.
3) Earn by CPA. This means that you will get paid everytime someone takes action on something. For example, every time someone downloads an app. Or everytime someone signs up to a website.
4) Provide advertisement on your website or through a medium where you have a big following.
The easiest way is the first 2.
