Ask HN: Creating tutorial for first time users of an app

I just finished creating the first version of my webapp, and I want first time users to be able to grasp a basic idea of how it works. What's the best method of helping a first time user become accustomed to the app? My possible ideas are below; suggestions are much appreciated.

- Create a video tutorial of me using the site and explaining features

- Create a written guide that explains the features and what the user's first steps should be.

-Create interactive messages that guides the user through my site. (I don't yet know how to do this)