Some websites that offer examples and instructions on how to write a script include Writers Store and Screenwriting.info. These sites feature a variety of resources for aspiring screenwriters along with basic introductions to screenwriting.
Writers Store hosts a comprehensive overview of introductory screenwriting, familiarizing writers with necessary terms and formatting elements. The site gives writers all the basic information needed to begin writing screenplays, along with tips to help beginners get started.
Screenwriting.info also covers the basics of script writing, including dialogue, transitions, extensions, shots and actions. The site offers a lengthy explanation of screenwriting essentials arranged in an easily navigable table of contents format. Screenwriting.info also offers more advanced tips and information for writers who have learned the basics.