If you are interested in an Internet-based Revit® "Essentials" course that is available any time your are, you may want to look into subscribing to lynda.com, where Paul Aubin has added such a course. According to the website, subscriptions begin at $25.00/month. Premium subscribers (starting at $37.50/month) also get access to exercise files. The class consists of 8:25 of video instruction; you can get more details here.
Your subscription also provides access to training on AutoCAD, 3DS Max, Maya and Sketchbook Pro, as well as many other software titles.