Making a blog is a way of expressing yourself. In a way, you have all the freedom you need to create information. You can write about news, politics, or you can write about yourself! You have to choose what kind of blog you want to do: an informative blog, a prescriptive blog or just some entertaining blog! Actually I chose not to choose, and did a little bit of each. You should make it attractive, with pictures, videos and other illustrations. A good blog post should not be too long! One idea per post is more than enough. Make your point with a few arguments, but I think a post should always be opened to discussion, comments, and not closed on an opinion! A blog is a start point to more discussion.
And if you have a writer’s block, you always have an ocean of inspiration in front of you! The internet is full of possibilities, but always keep in mind that you should not steal someone’s intellectual property!