Start a blog Drive traffic in to it Place ads in the blog and earn. That's the way to do it. But it is not as easy as it sounds.
the more visitors you have to your site, the more you are likely to earn. also the content of your site. some ads are worth more than others. ads about loans and finance tend to be worth a lot per ad click.
The more traffic you have, the higher chance of earning more from adsense. So, get your traffic from all the sources.
Regular post, quantity of your post, good quality content and good traffic will bring your Adsense earning increased. You may also try to modified the layout, put channels to tracking the big CTR. I agree with sanjewamad, "It is not as easy as it sounds and may need a long time" but you have to getting started to get a successful result.
If you want to earn more and more earning from adsense, first you prepare a site or blog for you. After creating a blog or site, open adsense account in google and set various advertisment in your blog or site. Generate more trafic for you blog or site for more clicks to your adsense advertisement.