Classes
A character's class determines much about the character, their skills, their blindspots, and so forth.
Name
Group (determines the thac0 and save progression)
Types (list of tags, shows which categories they consider to be class skills)
Hit-Dice
Combat Proficiency Points (how many at 1st level and rate of gain)
Skill Points (how many at 1st level, and rate of gain)
Combat Proficiencies (begun with)
Skill Proficiencies (begun with)
Traits
Special Skills (starting and progression)
Starting Equipment
Class Progression
Table 1 stuff: Level XP for Level HP (lists hit-dice and up) Thac0 Saves
Table 2 Stuff Level XP for Level Combat Proficiency Points Skill Proficiency Points Opportunity Actions Special Skill Progression (if any) Table 2 changes to reflect unique class features, like Attacks per Round, Turn Undead level, Total Thief Points or Special Skills levels
Table 3 Stuff Level XP for Level Class Features