I'm thinking about creating a screenplay,and sending it off. But I have a few questions.?

Okay. First and foremost: it just isn't that easy. You don't get to just send your screenplay off to a production company and hope they call you back. It doesn't work like that. People work for years and years and even old, seasoned writing veterans don't just get to write movies. Secondly, even if you did somehow magically inspire awe throughout the halls and corridors of said production company, you've no relevant experience in directing movies. Remember, there are guys who spend thousands of dollars and go to prestigious academies for years to learn how to properly piece together cinema. And this process is exactly what I am going to recommend to you. If you want to make movies, go to school. Unless you think your mind can match that of a genius like Tarantino, you are not going to succeed or make the right connections without it. For now, you're much better off buying a cheap camera and a cheap program and practicing making home movies. But kid, right now you're a long way away from Hollywood.