Zero Level PC.
Starting a game with nothing but the shirt on your back (and its borrowed).
In the beginning all are without levels.
The lowly serving wench to the toe-headed squire, everyone starts somewhere. When a character breaks from daily humdrum existence, they set out on a life long quest of personal growth. The life experiences from this point on cumulate in rounding the character into a person of power and influence far exceeding what a mundane life can offer. It also holds the threat of loss of more than anyone just beginning on the path could possibly conceive.
To roll a zero level character is not much different from creating first level character. The main difference is the lack of a stable Class Identifier. This makes creating a zero level to be a little more challenging. For zero level the HP , BAB and Saves are based on the 'leanings' of the stats as they read (example: The highest stat is STR then the character would have a leaning towards Fighter.)
Step 1: Roll stats as normal, subtract one point from any stat.
Step 2: Pick a "Leanings" Class from Fighter, Rogue, and Mage. (Cleric, Druid, etc are not available until first level).
Step 3: Roll HP minus one HD.
The leanings of a character are limited to three base Class Identifiers. They are: Fighter, Rogue, and Mage. The leanings of a character are based on body type and mental acuity. The idea is that a huge dumb ox is not likely to be a lithe clever rogue or a weak "brainy" mage and vice versa. All Class related categories are determined by these three. Class Identifier is chosen based on the core stat for each class compared to the highest stat rolled for the character.
The first step is to roll the stats. I assign them as they roll. Without a Class Identifier it is hard to decide which order they are best laid. Then subtract one from any one stat. The highest stat determines the 'leanings' of the character.
The dropped HD from the HP roll is rolled at first. The subtracted stat is added back in at first. Once a character has leveled to first they must decide on a Character Class. This is done as per any normal first level character creation.