Read the Adsense TOS, then start driving traffic to your site. However, if you have a site about something that has low ad rates...let's say...cheese makers in Chile, nothing will increase your income with adsense. You need medium to high paying keywords. TxDon
Def try and research what works best for your site, horizontal or vertical ads, Images or Text. Also try and have your ads towards the top of your site so that people dont have to scroll in order to click on your ads.
Lots of traffic and ads above the fold of the page. Also blend the ads as much as possible while complying with TOS.