Tabi, by default, the posts are organized by the newest to the oldest, with the validated belief that the web owner wants the most recent information (the hotest and latest news) up front. If date is not important to you, you can use a feature called “Adhesive” or “Sticky” which is available with plugins which may be found at http://wp-plugins.net.
Individual Pages are a brand new feature and still under development. But honestly, you can do anything you want with them, which is beyond the capability of WordPress since so many people use them in different ways.
Remember though, that Pages can not be in categories. Only posts can be in categories. Many people get carried away with the idea of the individual Pages, but their purpose is basically to create kind of static pages like About Me, Contact Us, Site Map, Sign Up Here, Events, and information that you want to stay accessible all the time.
I thought about using them to make my site a CMS (Content Management System) style site, but the real power of WordPress comes from the posts not the Pages.
While Pages can’t belong to any categories, they can be subPages of other Pages, so you can group related information together.
For example, on my site, I have a Page for About, and then under it I have subPages for Copyright, Legal, and Accessiblity Policies.
Posts have categories, if you choose to use them, or only one category, the base one that came with the installation. Categorizing posts is a powerful way of grouping your post subjects. If you only have one subject, then ignore them and just post your posts and let your users use the Archives to find past posts by chronological (date) order.
I hope this helps.
And be sure and visit the main WordPress documentation source at http://codex.wordpress.org/ for even more information on how to use WordPress.
