You could find a studio to send it to, but it will be basically impossible to make it unless you have worked in the industry for years, have a degree (called an M.F.A.) in screenwriting, or make it yourself and submit it to festivals.
For the first path you'll have to get a job as cameraman, an A.D. or something like that, and after a few years you may get approached to submit something you've written (if you express an interest in it).
For the second path you'd want to know what is the best option for you, is it a Hollywood film, is it more of an independent film? Whichever it is you'll want to look into what schools you can afford, and which meet your criteria. I'd recommend picking up a copy of Film School Confidential.
For the third path you'll need quite a bit of money dedicated into the project (between 30 - 90,000 min.). Also you'll want to check out every film festival you submit the film to because a ton of them are just set up to take money from young trusting filmmakers.
It will be almost impossible to get the film made without a complete dedication to the story. It will take years to get it made and after that it is never guranteed anyone other than yourself, cast and crew, friends and family, will ever see it. But if you truly believe the story is great then write and try, by any means necessary, to get it made. I'm not trying to discourage you, but you must be realistic you can't just think because you have a great story then you will get everything handed to you, you very well could have to work harder than you ever had (I could be wrong), and even then you may not be successful, but if you think your story is good enough I would whole-heartedly encourage you to get it made.