This can either be done locally or through an online service like Fiverr. Resumes are something that people can be very insecure and self-conscious about, which means there is always a demand for services that will help spruce them up. Holly Hanna from The Work at Home Woman wrote a really useful article on How to Make Money from Home with Resume Writing.
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.