I've Never Done This Kind of Thing Before

So, I'm in this AP English class at my school and as a requirement I must have a blog; let me tell you, I've never blogged before. See, I have this problem of not knowing how to put my ideas into words really well so sometimes when I talk it sounds like gibberish or I keep rabbling on and on asking questions like, "You know what I mean?" when I know the person I'm talking to won't understand a word I just said. I also have this really bad problem where I make sound effects, like BANG or KERPLUNKAL, to get a point across if I can't find the words to put it in a phrase. I'm kind of nervous about this whole blogging thing, process, whatever you want to call it. I truly hope everything goes well because I've never done this kind of thing before.