No it's okay! You don't have to read the comics for you to enjoy the content. So basically this movie will simply be about the joker and only the joker. The batman will not be in it, and it will mostly likely only be a single film with no sequels. This Joker will not be a part of the larger DC universe...that is what Jared Leto's joker will be for. DC will be doing this with other characters as well and they are calling these movies the "elseworlds" films...kind of like an alternate universe to allow different takes on certain characters.