The level system in this story will follow a D.N.D style. The levelling up requirements in most cases will require the MC to gain double the amount exp than his last level up. For example:
Level 1: 300 exp
Level 2: 600 exp
Level 3: 1200 exp
level 4: 2400 exp
level 5 4800 exp.
Following this the MC will gain plus one to all attributes on level up as well as gaining a new skill every two levels and gaining 5 'Free' attribute points or a feat that they can assign every 4 levels. Skills and abilities will level up as they are used. For example, force mastery gains exp if any force related ability/skill is used. If you have any questions please leave a comment and I will respond when I can :)