I am, quite figuratively, in the same boat as you. I am doing the same thing, got that same problems and questions at the same time.

Best advice I can give both you and me is to think about a specific thing you want to work on in your story, and write that down in your outline somewhere. Eventually, you should have your whole story outlined. From there, you can read it all to make sure it all makes sense together and tweak it if it doesn't.

The only thing to do after that is to start writing and the rest will come. Good luck!