When you get your first blog set up and ready, do not thread it as set in stone. You should go back and switch things around, do some updates and re-comment on the comments if any.
You could also re-write some of the postings and make sure everything is perfect before you go public.
I also recommend that you begin posting at your blog at least a month before you go live. This way you will build credibility and a stable readership before you really face the public.