Web development is an easy way to make quick money on the internet and you don’t have to go spamming people like a lot of idiots do. One quick way to get new business is to use a scraper or a program like Scrapebox to scrape websites that contain malware. Once you get your list of websites, you can contact the owners of each of the websites offering to repair the website or build one from scratch.
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.