Players will spawn in the Angel Lyceum. After talking to Tutor Wolay, you should go find the Angels' Tutor who will assign some quests to you. By completing these quests, you will obtain credits, once you have 5 credits, you will be able to graduate from the Angel Lyceum.
Go find the Angels' Tutor to apply for graduation and you will be teleported to the Graduation Palace. Find Michael to obtain your diploma and choose 1 of 4 factions that you want to fight for.