Here's the thing about first posts... they're lame!
It's usually some "Sign up for my newsletter!" crap or a "Here's how I built this site!" post.
Some people who are admittedly way cooler and less basic than I am, would start just showing off a cool project, an announcement, open up about what blogs mean to them...
But I believe it is human to be picky about what you share! So, for now, I will just say that I am so excited to have built this!