Read around the forums a while, Fabian, and you will read about some of the different things that people are doing to earn income. Also, I'll point you to a few posts on Lynn's blog (the owner of the forum) - she's done some awesome posts with help and ideas!
Here's one that's really good:
http://www.clicknewz.com/1679/starting- ... -business/
And here is a more current series that she is working on:
http://www.clicknewz.com/1892/10-ways-t ... ey-online/
Also, she is covering each of those posts in the series in her free weekly webinar (every Tues. 12pm Central) which you can sign up for here:
http://www.selfstartersweeklytips.com/webinars.htm
Also - I'm moving this thread to another more appropriate section.
Best of luck to you! Stick around and ask us any questions you have!