I don't think you should worry about playing lead just yet. It's best to get some foundation before you do that. Learning the theory behind the chords is actually a pretty good idea.. So you know why many chord progressions use D, A, and G for instance. There are some great lessons on the subject at this site :)

Alternatively: www.musictheory.net is pretty cool too.


www.chordfind.com can help you with any chord shape :)