Are you still trying to get started with Moodle? Are you part of a school? If so, were you considering Moodle because your school is using Moodle? If your school uses Moodle, chances are that your school has its own Moodle site. You will need to find a way to contact the people managing your school's Moodle site. They should be able to explain how you can get a course shell (your virtual classroom for your course); how to get your own account; how to be assigned as the Teacher for your course shell; if your students have to create their own accounts or if they are automatically assigned; and how students can find and access your course shell.
I manage the site for the University of Guam and we occasionally have teachers and students who hear the name "Moodle" and think that our courses are in the Moodle.org web site. You are not alone.