Best way is to do freelancing work. Lot of website available, just go through it.
One of my friend earns around 10 to 20k per month, just by doing some excel related macro work (part time). On a bright month, may be 30k or more.
A few difficulties you may face early
1) You won't get any projects, because you are new and no feedback yet (You need to bid low and almost work for free for a initial few days)
2) You are not sure of what you are good at !
3) Patience, as it may take months to get a project
4) Once you get a lot of feedback (read +ve), then it is relatively easy to get work
5) Remember, you are competing against most of the people in the world.
All the best. I don't know if there are any better method available in the market other than Article writing.
Plz don't fall trap on clicking ads and data entry kind of work. It is almost next to useless