Well I started monentizing my youtube videos about 2-3 months ago and till now i have earned like 50$ !!
All you have to do is upload intresting videos all the time and try to get views. As you become a youtube/google partner, you have the ability to monentize your videos! What that means is, that your videos get adds..yep those annoying adds that you see every fucking time you wanna watch a video! So when a viewer see an add on your video, your a something like 0.08 dollars, i know the numbers seems rediculous low BUT, imagine a video of yours taking 500-1000view hits every single day or even more while you dont do anything but sitting on your desk and try to make more videos so that you have more chances to earn more!! ;)
Take a look on my channel if you like. ;)
https://www.youtube.com/channel/UCqC-VqhQ0scZaYQ-fs-IFJg