Joomla 2.5 makes it possible to create a multilanguage website, out-of-the-box, without any 3rd party extensions. Here you can download a Multi-language Checklist to make it easier to set up such a multilanguage website.
Using this 10-step-checklist you should be able to create a multilanguage Joomla! website with two languages: the default English and an additional language. For any other language(s), take the same approach as the one in this checklist for the “Dutch” language.