I am not by any means a pro blogger but I do have quick tips for making a blog with substance in under 60 seconds (if you type really fast).
First, have a topic in mind that you like, know, and can run with.
Second, express your involvement in the subject. Why you are writing about it?
Third, keep it short. A suggested structure could be:
Topic
Detail
Detail
Detail
Close
That should be quick and sweet. Happy blogging!
blushedmelon's Blog 