Starting a blog . . .

So I've decided to start a blog. And I realized that I have NO idea what I'm doing. But we'll slowly figure it out. Trial and error.
I like reading my wonderful sister-in-loves blog and seeing that wonderful nephew and neice grow up in pictures. So, I why not do the same.
Plus, I've come to REALLY dislike the time consuming, unedifying, uglyness of Facebook.
So, now, how do I make this thing private? So it only gets looked at by who I want to look at it.