Once you're blog is up and ready to go, or if you want to improve your traffic and ratings, you'll want to submit your blog. Submitting isn't the end of the line though, you'll have to ping the sites when you update to make sure the crawlers are returning to your site often, picking up any new content you publish. This will help your blog get to the top of search results as well, because your content will always be fresh in their system, and pulled up in relevent searches.
Try submitting to some of the sites below, and then go to Pingoat or Ping-O-Matic and ping the sites you've submitted to, letting them know when you've updated.
You'll also find a pretty extensive list at Pingoat where you can submit your blog, as well as ping them when you update. This is a pretty intensive part of your blog advertising, but once it's done you'll most likely see a jump in traffic after just a few weeks. Don't forget to comment on other people's blogs, and as long as the topic is relevent to your blog, go ahead and include a link. It can help your rankings as well!