We all can start a blog today but only a few of us will actually stick through it. Many people get bore with blogging especially if the see no financial return or they get bored because they simply have nothing to write about. And dont forget with keeping up with posts. You will lose viewership if you only post like once a month. That is why I would have a general blog, you can cover different types of topic instaed of getting bored with one. And dont forget that the early stages of blogging is the toughest because you are building your readership and traffic. Its kind of hard to keep blogging if you feel that only you and your grandma is reading it, no offence granma! To really start making money blogging does take time, I mean to start really seeing hundreds per even thousands per month. so dont give up, like anything it takes time and dedication!