Or do what I'm doing, probably not highly suggested, but its the only way I can afford to do it.
Read a heck of a lot of scripts, study the format very very closely. Don't wing anything, if you want to know how to present something think of an example in a movie, look up the script and see how they presented it, then look up a few more to make sure that's the industry standard.
Write a lot, rewrite more than you write. Always keep challenging yourself and have some software so you don't have to sweat the margins.
Then submit for feedback.
Learn about pitching, practice it, write and rewrite your pitches, practice them outloud so you hear how they sound, read all your scripts out loud so you can hear your dialog. Do character studies of real people, do character studies of fictional people, when you watch movies try and figure out how you would put that on paper. Reverse the process.
Study, work, study, work, and pitch. And see where it gets you.