Roll 3d6 straight, 7 times. The last value is dropped, and you get one swap.
Class minimums will not be enforced, but if you do not meet the minimum, you must use your swap to rectify that if possible.
Strength: Ability modifier applies to melee attack and damage rolls, force door checks, and carrying capacity. (5 lbs per modifier point).
Intelligence: Gain one additional language for every positive point. Negative modifier reduces literacy.
Wisdom: Ability modifier is applied to all saving throws.
Dexterity: Ability modifier is applied to missile attack and damage rolls as well as your Armor Class.
Constitution: Ability modifier is applied to your Hit Die roll for HP when you level up. No longer applies at high levels when HP gain is a flat.
Charisma: Ability modifier is applied to the number of retainers you can have and their morale. Base is 3 retainers at 7 morale.