They say you play soccer the way you are. I think blogging is similar to this self-organizing sport. You blog the way you are.
When confronted with the chronological format of a blog, the pressure to post is at first extreme. How do I start? What if I don't keep it up? Does this go on my permanent record? But the reality is there is no shame in an empty calendar. Post daily, weekly, monthly or occassionally. You blog when you can.
The question that is most personal is what to blog. As one blogger said, "Find a topic and own it." Finding focus is a sure time saver, but it also contributes to the medium, as its one of specialized voices. The more you post on your domain the better. You blog what you are.
The other part, indeed what this tribe is about, is community. When you have others reading, others you know, their feedback and their own posts spark your own. You don't blog alone.
Make a little plan on how you will start, just begin and you will find your rhythm.