Here’s a well-written and easy-to-follow guide to best practice in creating the content for your blog, and then promoting it.
Written by Biz Stone of Blogger, the guide has the usual content you’d expect – setting up your blog, how to focus your post content (think of the audience), publish frequently, etc.
The guide also includes some extremely useful and valuable advice on some of the other things you should do if you really want to raise your profile, such as linking to other blogs, installing a blogroll and posting comments frequently on other blogs.
If you host your blog on Blogger, all of the guide content is relevant. If not, just ignore the Blogger-specific stuff – the rest is worth reading.