Test different layouts - without getting spammy - and different topics, and see what works. It takes some time to get it right.
Start with what interest you first eg your hobby etc and throw as much quality articles at it. Once you get adsense acc slowly expand your websites into more profitable niche.
Google’s AdSense is a fascinating revenue-sharing opportunity for small, medium and large web sites. What it does is place ads for other goods and services that are relevant to the content of your site, and targeted to the people who frequent your pages. In turn, you get paid a small amount when the ad is either displayed on your page ( (pay per impression), or clicked on (pay per click)