The Miracle that is Celtx

To write a screenplay, sure, you can use Microsoft Word if you can format it correctly. But it's much easier to use a screen writing program. Most people tell you that you "need" Movie Magic or Final Draft, but really, Celtx, a program that can be downloaded from the net, is probably all you really need. It can convert your screenplays into PDFs, it formats and it's free.