I would suggest Don't. Seriously. You'll get all the wrong impressions if you jump head-first into a multisplat game without really getting a feel for what the goals of each game are. Consider Vampire, Werewolf, Changeling et al to be different campaigns. You want to finish campaign A before mixing in Campaign B, otherwise no one will know why Excalibur is in the hands of a Dalek who threatens all of Faerun.