If you want some extra income through internet. i will the the way to earn money. there are various types of things to earn money.

Typing jobs
Affiliate marketing
publishing marketing

and more things.

typing jobs are special because you have fingers so can type and earn extra money.
there are hundreds of sites to enter data , they pay for you.

Affiliate marketing is a master way to earn money, first you want to affiliate with a website then you can get banners and display on your site.

If a customer come and purchase a item you can earn a commission......

Publishing marketing i will tell in another chapter.

Srilanka ,
Most people try to search jobs in overseas. But there are hundreds of jobs in srilanka.
If you try to see .. If you have ability to work and small english knowledge you can do a urban area job.

Dont go for overseas jobs. Some are fraud.