Divorce

So I think I am finally going to divorce my husband. It’s so hard for me to actually say that and come to terms with it. We haven’t had a easy relationship at all. But nothing is changing. I trued to make it work but we just keep falling back in the same cycle. I’m tired of being in a controlling relationship, he acts more like my father then my husband. I am tired of all of his empty divorce threats. He is always saying he thinks we need to get divorced but never follows through with it but this time I am. My question is, where do I begin? I have never done this before. Also how am I supposed to stay strong and stick with it and not run back to him? We don’t have any kids. Any advice would be well appreciated. Thank you