There are hundreds of ways to make money on the Internet.

Once of them, as already suggested, make a content and meaning ful website and put some ads on it or make a section for members online and take some payment for it.

Another thing could be to sell some services like content writing, seo optimizing advertising, article writing, web hosting (just as reseller) and so on.

I am sure, this list could be endless, just try to think about it a few hours.