As you are a heavy person, you are even MORE likely to benefit from barefoot running.  I would suggest checking out Barefoot Running by Michael Sanders.  The biggest thing is to GO SLOW with your transition.  I was heavy, also, when I started running in my VFFs, and while I am lighter now, I'm still probably on the heavy side.  I have no injuries and LOVE running light - it's a totally different feeling.  Good luck!