Hugely interesting and useful page from the BBC offering a range of standard script formats. You aren't expected to follow these styling formats when you submit coursework -- please don't, keep formatting very simple -- but you should be aware of the elements that a director, producer and performers will need to know about in order to make sense of your script.
When you submit a script for consideration later in your professional life, you will need to follow the formatting standards -- so you may well be interested in becoming familiar with them now!
http://www.bbc.co.uk/writersroom/send-a-script/formatting-your-script
