my first question is : do you think that blogging can pay as well as writing novels can?
Yes, if you're the chick who thought up "i can haz cheezburger." Otherwise, probably not. The money to be made in blogs is pretty illusory. I think the ads in my blog have made me about $70 total.
My second question is: how did you become a writer?
I started writing when I was in 3rd grade. As to how or why, I don't really know. As to how I got published: practice, practice, practice, followed by rejection, rejection, rejection followed by a little bit of luck and a decent manuscript after 10 bad ones.