what to do to get some extra income online?

Well, if you think that you are a skillful person or have some knowledge in programming, data entry, or writing articles, you can look for a job in www.odesk.com or www.freelancer.com... there are lots of freelancing jobs out there

Scan through the "make extra money", "make money online" and other similar interest categories. This is one of the most common questions asked on MyLot and there is a TON of helpful, useful info supplied by many, many people. I'll blow my own trumpet here, too, and suggest popping into my profile - there's a Beginner's Guide in there that's free and should give you some ideas. (First thing on the right hand side.) Good luck!