write GOOD...

The number one rule about writing a screenplay is ORGANIZATION. You also need to have a "inner road map that your characters are going to generally follow," says the site. General ideas work for a novelist becasue they have time to ramble and work their ideas together. The other main thing to remember is structure, structure, structure; no one wants to read a rambling screenplay.

"The basic structure of the three part screenplay is:
1) Establish you character and general situation ,
2) force him up a tree and throw rocks at him and
3) get him down again."

There's more to a screenplay than the actual piece itself, the writer has to be disciplined, tough, and a lot of luck.

So, GOOD LUCK!