Alrighty so I didn't have time to do anything for this today but I've got ideas!!(yay)
Hopefully tomorrow I'll have time to makeup a thing.
So far I've got that:
There will be two 'groups' of 'people'. Vampires and humans. A few humans will be hunters, who of course hunt the vampires. Vampires are a lot like people, they think and feel and stuff, this is because they used to be a human.
Vampirism is kinda like a disease. When a vampire bites you, you either die or become a vampire as well. Vampires eat people to sustain themselves. Their bodies stop being able to process other foods well and if they do not eat humans the disease that is vamparism will kill them.
This is a problem for humans cause they don't wanna be eaten.
I'll probably make us a hunting group so everyone will either be a human hunter or a vampire. Your human hunter can get bitten though and turn into a vampire, they'll have to keep i t a secret or get killed by their friends. There is no cure except death.
Have fun thinking of basic character stuff for now, I promise I'll get you a real thing tomorrow!