There's obviously no easy way. You have to work hard on writing quality unique content, SEO, and be patient.
Out of the numerous people who responded to your question, in my opinion BMR777 has offered you the best, easiest, free and scalable advice. The advice provided by him is a goldmine, all you need to do is take action. User generated content is the easiest form of revenue if you want to earn from Adsense. You have to take care about the ads if you monetize with other forms like Amazon whereas in Adsense, you just use their codes and Google will automatically generate matching ads based upon the content. This is very useful where you may have lots of pages with different types of content. Probably the coolest benefit is that such content is scalable and before you know what is happening, you are sitting on a pile of cash. This advice is applicable for all those who want to earn from Adsense. Only thing needed is coming up with something which people are badly looking for and providing them a way to do it. However, it may not be easy for newbies as it would need some knowledge of how to set things up.