There are 10 classes currently. Vampires, Werewolves, Ghouls, Demons, Necromancers, Priests, Witchhunters, Shades, Angels, and Sirens.
You can find out what each class does, and more information about them to include videos by going HERE
Use /f upgrade
After you receive 10k exp in 45 minutes you will be placed on an EXP restriction.
/skillname (example if you're mining do /mining Excavation use /excavation )
Do /stats and immediately after do /mcscoreboard keep