A new blog should not add to the existing noise the blogosphere. Do something outstanding to get noticed.
Write regularly, neither too often nor too rarely. Two to three blogs a week is a good frequency to maintain.
Avoid using SMS abbreviations in blog post and at least run the post through a spell-check in MS-Word before publishing. If the bloggers cannot take the time out to write proper English, why would the readers bother reading through that cryptic puzzle?