FILMSCRIPTS
Fortunately there is some help out there. I cannot recommend highly enough The Screenwriter's Bible, by Dave Trottier. Even if you have no intention of writing a filmscript, if you have any interest in writing at all, you will find The Screenwriter's Bible a fascinating read. Inktip.com is a great site to place a script once you have finished it. And while you are honing your skills (whether on filmscripts or on any other sort of writing), you cannot do better than Zoetrope.com. Set up by Francis Ford Coppola, this free site enables you to put material online so that it can be criticised by everyone else who has joined Zoetrope - provided that you make the quota of your own reviews.