Rolling stats
Either:
- 3d6 and arrange freely, or
- roll 4d6h3 in order down the list, or
- roll 3d6 in order down the list, but for one ability score you may roll 6d6h3.
The first lets you roll and customize; the second lets you roll and have slightly above the fold on average. The last makes someone who is likely to excel in one particular ability of your choice.
Unplayable characters
Your new character will be considered unplayable if the total ability score bonus is less than zero. If this is the case, reroll your character.
Of course, if your stats get lowered during play you may not reroll your character.
Zero to hero 
