If you're not changing much vamp lore, I advise you do some research on them, then. There are books that you don't have to read, but at least read the plot and theme stuff on wikipedia. I mean, you have Dracula, but you also have The Vampyre
which predates Drac, I believe. Nosferatu is a more monstrous vampire, but still linked to sexuality so he should also be looked at.
Also you should probably decide if your vamps have a form change or not. I don't mean batform or anything, but frequently in visual mediums there will be obvious changes (Supernatural had retractable fangs, Buffy had "game faces"). Obviously books are not a visual medium, but it is part of vampireness world building, so it's something to consider.
edited 16th Jan '13 9:29:42 AM by MrAHR