One way to monetize your blog is to join Affiliate programs. That means you get a code which show and Advert or a link on your site. But you will not be paid by click, like the Ad Sense from Google, but only if the user subscribe their deal or buy a product.

So you will not get money for a click on the Ad but on the other site you will get much more than only for a click if the visitor buy the product. That is also a reason why to have a blog with content so you can better choose affiliate products and earn more money.

And trust me it does not make sense to join affiliate for computers if you write about garden and flowers!