First off make sure you write stellar content and include long tail keywords in your blog articles.
Also write content that includes keywords that get 1,000 or more searches per day as this will help you increase traffic to your blog once you get your content ranked in the search engines.
If you use keywords that get a lot of searches per day it will take less articles to start seeing good enough website traffic to your blog.
Other ways to promote your blog are pinterest, twitter, forums and youtube.