Pages is a good all round word processor but I use a piece of software called Storyist. It gives you a full range of templates for all kinds of creative writing, allows you to create 'cards' for characters, scenes and a whole host of other useful features to keep your writing organised.
You can learn more about it here http://storyist.com/index.html.
Since you have a mac, there is an app in the app store for your desktop called Scrivener customized for writers. With many features - you can use it for novels, screenwriting, plays, etc. It's $45, check it out. http://www.literatureandlatte.com/scrivener.php
Pages will work of course - but for me, I avoid word processing programs like Word or Pages (never really liked them). Scrivener syncs with my iPad (the text) which is convenient. Just one person's opinion...