I believe it would be wise to read through the first post and use the character sheets given within the second. Moroi can only control the elements, water, earth, air, fire and spirit. One is normally far more advanced, which is the one they've specialized in. Most have very very little spirit if they specialize in any of the other elements. They also can only specialize in one. Spirit is very rare and we already have two people, I'm not sure if more would be accepted. But ya, you might want to use the CSs provided and read the first post in its entirety.
-EDIT-
This is also taking place in Modern day. Moroi look like really tall, pale, thin humans.