Simple content management

I would like to build a site that has the following 2 types of stuff:

1. Static pages that will be edited with a WYSIWYG editor
   1. I suppose Drupal has something built-in? What is it?
   2. Will I be able to structure these pages in a hierarchy (a simple tree)? How?
   3. Can I apply a different theme according to that hierarchy?
   4. Can I have different editing capabilities by different users?
   5. These pages are billingual. Actually the whole site is in 2 languages. Will I be able to switch between languages? Is there a recommende way to have multilingual Drupal sites?
2. Dynamic pages of different arrangement (like course page, person page, school page etc.)
   1. I'm thinking of building a module for every different kind of page and a specific form for adding every specific type of page, eg. a form to ass a course page and associate it with a peson page. Is this the "drupal way" of doing things?
   2. Will I be able to apply a different theme to every module (from the above)?
   3. Since these pages are billingual also, will I be able to switch between languages?

A lame :) example of a structure follows:

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