While playing, hit ~ to bring up the console. Then type in "DebugMode 1" without the quotes. You may then use the following codes.
Code - Effect
irolltwenties - 20 in every statistic.
givespell # - Gives a spell identified by it's id number to the character.
givexp # - Gives the desired amount of XP to your character.
dm_god - God mode
SetCHA # - Set charisma to given number.
SetCON # - Set constitution to given number.
SetDEX # - Set dexterity to given number.
SetSTR # - Set strength to given number.
SetWIS # - Set wisdom to given number.