Define your goal
In order to attract any investors (in the form of advertisers) you must have a place for them to sell their wares. Attracting advertisers must be your primary goal, as that is what will make your financial aspirations a success.
Know what advertisers or ad placement algorithms are looking for in an advertising venue (i.e., your website): generally, it’s potential buyers with disposable income who visit your site in significant numbers, and would be interested in products that are closely related to the content on your site.
What you want in a site, then, is to attract and keep a lot of visitors. The longer they stay, the more likely it is that they will eventually leave your site by clicking not on the back button, but on your advertiser’s links.