Decide early on what you want your blog to do. I have one for my quilting. I try real hard to keep it quilt related, but sometimes life sneaks in, like my video of the twin tornadoes last summer. I'm using Blogspot, but it's just because it was first on the search engine when I was looking to do this.
I'm always finding new things to do with it. Just this week I started adding pictures of the pantographs I have available. It's not done, but it's cool what you can do. I guess what I'm saying is that once you start, you can change and add things as you want or find them.