Should I read a bunch of more modern stuff before jumping into Gibbon's Decline and fall? Should I read it at all? Regardless, are there any other works regarding the fall of Rome that are required reading?
Most modern works are influenced by the decline and fall, so you don't need to. However, it is important to remember that Rome never really "fell", it just sort of faded away sometime in the early middle ages.
I'm currently reading "The Inheritance of Rome". It"s very well written