Here’s a quick video that highlights the process of creating a course to start building in Moodle 2.5. The specific role used is the course creator role (things will only look slightly different as a full administrator). It covers navigating to create courses, configuring settings, and enrolling users.
Full video is about 8 minutes and is by Nellie Deutsch of the Moodle for Teachers course at WizIQ.
Direct video link: http://www.youtube.com/watch?v=ijDXZdhtQbY