And yes, if you do commit to something like blogging, or writing and freelancing, you can and will make a living (you could even make way more than you could ever at your day job. That said, no matter how much time and effort you put into things like surveys, paid to click sites and things like that, they are not gonna replace your day job. They are just an attitudinal income generation options that you can use in your free time.
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.