difficulty in earning through blogging

It is my first time to blog. I love writing about certain things that I have interest at but at the same time I want to earn money through blogging. I visit most of the sites wherein I can earn money but It seems I can not post my blogs because they are looking for something I can not figure about. All I know from this moment is that I made a blog about my favorite dessert and I want to post it to other site so other advertiser will see what I am capable of doing in my writings.Does anyone cares to teach me how can I really earn through this blogging. I really want to earn and I want to make this hobby as a form of earning cash. Right now I am getting frustrated with the hours I spent in making my blog do earn. PLEASE HELP ME!!!WILL SOMEBODY HELP ME…I  really want to learn this art of blogging. Just tell me how and I wish I can really figure out the things I must learn to be successful to this form of technology.