Writing screenplays...
Sure, you can go to classes and seminars, etc., but you can get the same info via DVDs and books and finding pertinent videos on YouTube. What you need to be doing--if you haven't done so already--is read lots and lots of pro movie scripts. Read them, study them, take notes. Let it all sink in. Then sit yourself down and write a script. It doesn't need to be a feature-length; a short will do just fine. Get critiques from people who actually know how to write a screenplay. Rewrite, rewrite, rewrite, get critiques. Keep writing, keep reading pro scripts. Trial and error is what it's all about, seeing what works and what doesn't. It might be a year before you can write a script that could potentially sell. It could be two years, or five years. It could be never (sorry, but not everyone can write a marketable screenplay). But when you have a couple of solid scripts that are FANTASTIC and ready to be seen by the powers that be in the film world, get yourself there. Los Angeles. This is where a majority of the filmmaking action is. Once you're here, meet people, get them to read your scripts. Hopefully they'll become fans of your work. Hopefully it will lead to something big.
But first...learn the craft. Read scripts, write scripts. Don't wait. Start NOW.
Good luck!