Courses, I don't think there are many free courses and as Steve said i would not recommended them at this stage, I would as your DBA at work if you can sit down with them and get them to take you through the basics. Try this site below for some of the basics.
Good luck also I signed up with Robert Half who gave me a free books 24/7 account this is very good for sql books and free courses. I live in Japan however, So I am not sure if they do the same where your from.