Don't forget the Fundamental lessons 1 & 2 under the Core Learning.
Here's a sample from Fundamental 2.
http://www.guitartricks.com/lesson.php?input=11060&s_id=433
If you scroll down you'll see a photo of finger placement.
Like John pointed out to using the chord finder, but the lessons teach you how to do chords properly to change from one chord to another.