The design you made in Fireworks is just that: a visual design, nothing more. To make a working applications, you will have to develop it into a working 'real' app. Fireworks cannot do this for you. Which means:
If you have never learned to code before, now is the time! It can be a lot of fun. You will be learning for at least about half a year before you can start your app, though (well, depends on the type of application you have in mind).
2) you use a visual mobile app development tool. I have no idea what type of app design you have designed, but candidates for this are: a) Unity, b) Scirra Construct, c) Game Maker, d) GameSalad, and others. Some of these still need (basic) coding skills. Flash can also be used - but again, you will need to code in ActionScript.
3) if the above options sound like too much work, you could always hire a developer to do it for you.
There are some quite good books on app development. Do your research by googling it.