You can start a blog on any number of platfroms, from WordPress to Squarespace. Once you have content up and your numbers are high enough, you can start offering brands with a similar mission affiliate marketing. This means you will indirectly market their products or services weaved into your content. When you sell their produt or service through a link on your site, you make a percent of the profit.
^ Jump up to: a b c d e Golden, T. D.; Veiga, J. F.; Dino, R. N. (2008). "The impact of professional isolation on teleworker job performance and turnover intentions: Does time spent teleworking, interacting face-to-face, or having access to communication-enhancing technology matter?". Journal of Applied Psychology. 93: 1412–1421. doi:10.1037/a0012722.
One of the cool things about Google AdSense is that it's so easy to get set up. If you have a blog or website, you can sign up for a free Google AdSense Account. From there, Google will give you a unique code that you will paste onto your website. Google takes it from there, tracking your page views, traffic, and earnings on your behalf. There is no upkeep or maintenance to get this thing going, which makes it a no-brainer if you have a website already.