Let me get started on those:

[hider=Vampires]
Vamprism is a microscopic symbiote. Anything scientific beyond this is difficult to find out because of its magical nature. It is a blood born pathogen, and once entering the body(through blood contact) there are two stages. Repair: in which the simbiote physically repairs damage in the host body, and removes imperfections. This stage can actually consume the symbiote. If the infection percentage isn't high enough, a human can survive this stage without transforming. 

After a certain threshold, however, the second stage will occur. Conversion. Much more straight forward, the symbiote starts making alterations to the body to make way for the functions that it requires. 
After a full conversion, the symbiote is required for the host to live, and there is no cure. Introduction to sunlight part way through conversion can, however, put a stop to it. The conversion is painful, stopping it with sunlight is even more so, and can actually cause permanent scarring. The earlier one attempts to stop the conversion, the better off they are.

The symbiote releases an acidic byproduct upon contact with UV radiation, which is what causes the "burning" that vamps experience in sunlight.

Vampires are a little stronger, and significantly faster than the average human, and their senses are amplified. They can see infrared in addition to the normal visual spectrum. 

Vampires have two very dangerous compulsions.

The Thirst is the need to drink untainted human blood. They can be staved off with pig's blood, but they will starve eventually without human blood. Donated blood satisfies the symbiote's biological needs, but it doesn't satisfy the vampire's Thirst. Many poorer vamps who can't afford to pay humans for their blood live, perfectly healthy, but always feeling thirsty. 

The Lust is what replaces a vampire's sexual desire. It is the need for something to drink your own blood. That is, of course, how vampires proliferate. It becomes harder to ignore over time, but can be staved off with blood letting(though this makes one need more sustenance). Vampires can satisfy their Lust by drinking from each other, however drinking another vampire's blood does not satisfy one's thirst, and having your blood drank increases the thirst. Vampires "feeding" on each other will always grow thirsty, and they will drink to satisfy it, and this makes them over engorged with blood. It is very comfortable, much like a human eating too much on Thanksgiving. 
Lust is particularly strong immediately after feeding on a human, but after "siring" a child, the Lust can wane to an ignorable level for decades at a time.

TL;DR: Well I'd rather you go back and read it, but the "rules" for vampires are:
Humans convert upon drinking a certain amount of vampire blood.
Vampires burn in sunlight.
Slightly stronger than average.
Significantly faster than average.
All sense increased.
Can see infrared.
Have a biological need to drink human blood.
Have a psychological need for the blood to be fresh from the human. 
Have a psychological need to have their own blood drank.

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[hider=Werebeings]
Were beings of any kind will be allowed. Stand by for a full description of limitations. 
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