If you only want to display specific pages you select manually, the easiest (and free) way to do this is with the manual nav add-on:
http://www.concrete5.org/marketplace/addons/manual-nav/
This is a quick and simple way to do it if you need to have a non-complicated menu (i.e. not a nested ul or a dropdown). Plus your clients can update it themselves (if they know their way around a web admin)