Hi. I recommend using Facebook, to start with. Create a Facebook fan page for your blog. Invite lots of Facebook friends.
Next, use twitter.
Also, be active on Yahoo Answers, Pintrest, and Tumblr.
Finally, write for another blog, as a guest blogger. Participate in blogs and forums similar to yours.
I hope this helps. :-)
David
(SpiritualTeachersList.com)