Blogging's easily the most addicting thing. I just started last month and can't stop.
All I've done so far, is like sarahbaram suggested, use twitter. And when you do tweet with the link to your blog and the title or whatever, make sure to al so enter something like "#poetry" the #poetry will make your blog show up in the poetry category of tweets where it can be seen by anybody that types "poetry" into their search engine.
I advertised my blog a couple times on my two favorite Pens hockey blogs, but I don't really do that anymore.
Also, as sarah said, engage yourself in the community here. Open dialogue on posts that you like or find interesting on somebody else's blog.
I'm by no means an expert, these are just some things I've read and heard.
These are some articles that I found very useful:
Very useful blog for someone new to blogging.