Blogging community is a virtual arena. Express yourself by blogging as well as commenting on others' posts. It highlights you and increases traffic.
Grammar - Depending on the language you use, blogging just makes it imperative that you are reasonably good with your grammar skills and proficiency if not a master. Remember your audience is a mix of both; the ones who are experts and the ones who are not.
Put advertisement but make sure that your blog visitor doesn't get irritated when ads pop up one after another like a flood.