Step I: Check with your Dungeon Master.
Before you begin creating your character, you should first discuss this process with your DM. He may have house rules that affect this process, either directly or indirectly. You should also see what the other players are creating. You want your character to fit with the overall feeling of the group, and you also want to make sure that a PC group has basic concepts covered (combat, healing, stealth and magic).
Step II: Generate Ability Scores.
This campaign guide assumes that the ability scores of characters are generated through the organic method. Roll 4d6, disregarding the lowest die, for each ability score. However, each ability score is rolled in order (Str, Dex, Con, etc). You may choose to re-roll any one result. Finally, you may swap two ability scores of your choice.
Step III: Choose Race, Class and Birthsign.
Before you begin the process of character creation,