Lets pretend the story is done, what environment would you build this in? I am really focused on mobile reach. It appears quite easy if I simply wanted an html5 flash deal, but I need more direct reach into the mobile handsets. My other huge concern is the ability to save progress, what mechanics is involved here?
I really don't see why you wouldn't just go with html (or something equally as simplistic) in this case unless you specifically want it to be an app for whatever reason or you are looking for some simple coding experience.
- Easy implementation. If you just make it as a basic website it will be easy to create the visuals (html and css are very simple if you aren't already very familiar).
- You will have "mobile reach" as anyone on a phone can go to your website where it is hosted (you can even have styling specific to phones)
- You can easily continue to progress the story. That may be a big one that you didn't think of, as instead of having to push updates out for people to download if you ever want to progress the story, any user will automatically have the extended story when they go to your site.
- It's very accessible. Any platform which simply has internet access will be able to go through your interactive story. You don't need to worry about going through an app store or having the right platform.
Those are just the few that immediately came to mind.
For what it is worth, you're not creating a game. That's not a good or bad thing, but worth mentioning to understand what your final product will be and how to get there.
As for your implementation... the three main things seem to be a story flow, art work associated with that story and finally implementation, which should just consist of presenting the text and image with a few options. After you get one iteration of the story done, all of the rest will be very easy to knock out as you will just be using the same method to progress the story. Good luck!