What do you look for in a informative blog?
People tend to blog about things they have interest in.
Your question really indicates what the content of the blog will be if it is informative.
I would be sure that your blog highlights “information” your audience is seeking information about.
If it is a persuasive blog on the other hand, the content should incite them to change how they think about a particular topic.
I hope this gives you some direction.