create blog...post good, unique, informative and quality content....promote the blog to get lots of traffic on it...then put adsense or other affiliate banners on the blog which will earn money for you.
You can actually sell some products through your site and the sellers would want to advertise with you...
There is no automatic system for that... Create a blog, post ads from adsense, then you will earn when people click on your ads..
The best is to base the blog on your experience, write your impressions about up-to-date news around you, and write about what you love. btw, search box doesn't bite at all ;]