Hy.
For my opinion you should focus on ranking your website, #1 will sure drive you traffic, and the income....
From my little experience and here I'm talking most from what I have read around here and over the web the best way to do it is to search for a low competition keyword with a lot of traffic and reach #1, this and keep your blog up to date and with new content sure will make you see the income.
Thank you.