Upon completion, your movie is automatically protected by copyright, no further action is necessary. If you want the additional protection of formal registration the US Copyright office provides online filing. Go to the homepage at http://www.copyright.gov & follow the appropriate links.
Presuming the script they came from is copyrighted, Yes they are.
Any material that you yourself have not expressley created is copyrighted. To upload it to myspace you would likely need to obtain legal persmission from the copyright holder.
for it not to be pirate copied or for the movie not to be copied
By seeing it in a cinema.
Yes, movie lines can be copyrighted as they are considered a form of creative expression. This means that the original creators of the movie lines have the exclusive right to reproduce, distribute, and perform those lines.
so you could know that it is copyrighted
Yes, movie quotes can be copyrighted if they are considered original and creative expressions. This means that using them without permission could potentially infringe on the copyright holder's rights.
Yes copyrighted movies cost money.
Well, it is illegal so I wouldn't do that if I were you.
If it is an original creation (of your own) and not copyrighted, then you can play it wherever you like.
Yes and it is illegal to copy movies that are copyrighted.
Movies are protected by copyright. Inventions are protected by patents.