Consistensi is a key component of a successful blog, so I do not suggest to forget about profits in a few months early - even up to six months if necessary - and provide a focus on value. These reasons encourage you to choose a topic you could write every day without benefits (it is a good question that can be asked it to yourself - Could you write every day about the topics you choose?). On the other hand, you do not want to blogging 12 months to produce a few dollars a day. it is important also, ultimately, specify the type of reader you want to pull, whether they buy something, whether you could sell something, or find a sponsor who will pay to advertise to your readers.