One of the things I think a blogger needs to do when starting out is figure out what he or she is going to write about. Is it going to be personal or professional? Funny , sad , full of factoids or just ramblings and gems from the cranium.
I have been blogging for a little while, I actually had another blog I started a few years ago but that became like a personal attack on any bad customer service experience and while funny and cathartic I think blogging negatively all the time is just bad karma. So be mindful if you blog negatively, it’s ok to be honest about your experiences but then let it go.
Blogs do not have to be long, in fact short "snackable content" is preferred so your message is short, and sweet and too the point. The only other important thing I can recommend is hitting spell check before you hit publish post.
Write about what you like about, what you know about and don’t be afraid if the blog you write isn’t perfect. It’s about what you like and want to talk about. it can be about nothing in particular. If Seinfeld wrote a blog would it not be about nothing? Nothing can be interesting.