victortiti89,
I will answer your all ten of your questions with a single question for you at the end of my long-winded diatribe. First here are some quotes I've pulled from posters on this forum:
(1) "Most new writers and their scripts just aren't that important"
(2) "Your vision/opinion will probably be of little interest and of even less importance to the Producer and Director"
(3) "The script is a blueprint. The spec script writer IS the architect NOT the construction team or interior designer"
(4) "your opinion is squat unless your Joss Whedon or A-list Hollywood screenwriter"
(5) "You are not writing a film, you are writing a script which may form the basis of a film!"
...As you can see, the opinion of what a scriptwriter's role in the creation of a movie is all across the board.
In one instance you are creating a blueprint. A "Blueprint" by definition is the guidelines for building something. A construction team uses a blueprint to build a house. True, they may change things along the way (add a wall, add a window, widen a closet) ...but they STILL FOLLOW THE ORIGINAL BLUEPRINT! ...That's what it's there for.
That blueprint is YOUR screenplay.
On the other hand, posters in this forum will tell you that your opinion really doesn't matter. What you put in your script is not important. "Your screenplay may form the basis of a film". In house-building terms, the blueprint created for the house you're having built "may form the basis for building your house". In other words, the building contractors take a look at your blueprints, get a few ideas from it ..and then draft up a whole new set of blueprints on what THEY think might look nice.
victortiti89, The questions you are asking look to be coming from someone who is wondering if writing a movie screenplay might be an interesting thing to do. You are wondering how hard it will be to be successful. What hurdles will you have to overcome? Who are these "managers"? Why do I need them? What if I fail? Is it worth the money to travel down the script writing path?
Everything you're asking is what anyone who ever wondered about becoming a scriptwriter has also thought. From what I have read and learned it all boils down to two basic philosophies:
(1)
"If you write a great script Hollywood will find you" (Link)
(2)
"If you write a great script Hollywood will find you is what people who have sold scripts say to make themselves feel special. Writing a great script isn't the hardest part; the hardest part is selling a great script to Hollywood if you're on the outside." (Link)
SUMMARY:
If you live by "Philosophy #2", then keep asking more and more questions. Keep getting feedback from the people who struggle each day to make a name for themselves. Keep networking and hope that you somehow find that special person, that "key individual", that will help you break into the market. Keep realizing that you are a small, insignificant cog in a gigantic Hollywood machine to which your chances of success are minimal at best. ...But if you focus on networking, schmoozing, joining writer's clubs, screenplay forums, locating these key people in the industry, then you will increase your chances of possibly getting a writing assignment. Take those small, calculated steps up the gigantic Hollywood corporate ladder. Squeeze by that writer who's a few rungs above you. Hard work, networking and dedication are your best option for getting there.
If you live by "Philosophy #1", then all of your questions have been answered from the very start. You have to sit your ass down and write the VERY BEST MOVIE SCRIPT you possibly can. It must consume your life. Every scene must sing to you. It must tear at the very fabric of your soul. It must haunt you day and night until you finally complete it. When you are done with it and print it out, you should feel like Moses holding the Ten Commandments. If you live by this philosophy, then you believe what you are writing is the most important element of a movie. It IS the blueprint! You believe that one day people will sit down in a movie theater next to you to watch the movie based on YOUR movie script. You believe that if you build it, they will come. You believe that if you have something you believe in so strongly that Hollywood will want it ...then all the pieces will fall into place, because that's what life is all about.
Now, you will get endless arguments regarding these two philosophies on just about every Screenplay forum you encounter. All aspects of writing a screenplay fall somewhere between these two philosophies ....but ultimately you can only serve one master. If you try to live somewhere in between, then your entire screenplay concept is a watered down philosophy. You are just another "luke warm" writer lost within the multitude of people wondering if writing a Screenplay would be the right path to take in life.
Which leads me to the question I said I would ask at the end of my long-winded diatribe:
victortiti89 ....Which philosophy are you going to live by?
-Birdman