I guess you have to blog something out of the box, that will get you into the first page of Google. I first started on review on the seminars I attended (I was working in a seminar company), 1 post the most 3 times in a month, then on the 4th month, the page rank suddenly went to 3.
Later i found out that I was using some keywords that a lot of people are using to search but not much competition there. Keyword research is also very important too.
Read
how to keyword research for your niche.
This is my new blog on the seminar review, previously in wordpress.com, so the page rank is not the same.
Seminar Event Review | Motivation, Educational, Financial Seminars Insightful Reviews