Look around and identify 3 blogs where your audience hangs out. Do a search and find other blogs in your area.
Next, join in on the conversation and be sure to leave comments (and don't forget to leave a link to your website so others can find out about you)
1. Figure out what you blog post will be about. (who is your audience, what your writing about and why your writing about it, what is the key benefit.
2. Do a little bit of keyword research. Hint: Use Google Keyword Tool
3. Pick your keyword and relevent keywords. Hint: Only 1 keyword per post.
4. Use your keyword in: the title, in the body of the post