Pretty open ended question.
You gotta get content out there. That's big. Get 20 - 30 blog posts up and don't worry about "promoting" them as such yet. Need to have a base first.
Once you have that "base", here are 30 Ways You Can Promote Blog Posts
. Cathy Stucker is a genius.
This post is 6 months old. So, maybe you've grown a little more savvy. Please reply with any specific questions.