Ignore the "ignore the" advice, Lane. If you can play Drop D, then its not that much further to a G or E tuning and then you can eliminate one middle man in your development as an open tuning player. Come back to Drop D after you have figured out G and E and then what Marty says will make more sense. It is a tuning that while easily played by people who have little experience it also can be played beautifully by folks who have figured out a few things with open tunings in general, especially with the top strings.