Here are some useful links on how to write a script.

http://www.screenwriting.info/

Writers Stores

The Script Lab

http://www.bbc.co.uk/writersroom/writing/tips_shortfilm.shtml

http://www.wikihow.com/Write-Movie-Scripts

You can download a screen writing program from the following site.

http://celtx.com/

Following links will have useful info on writing and shooting. These links are from various sources and the content might change without notice. Also you may find useful links from some of these sites.

http://www.youtube.com/watch?v=h4qgpimdyMI&feature=related

http://www.videojug.com/film/how-to-format-dialogue-in-a-film-script

http://www.vtkproductions.com/dar_storyboards.htm
http://accad.osu.edu/womenandtech/Storyboard%20Resource/